diff --git a/example_packages/preprocess_cpp_suffix/.gitignore b/example_packages/preprocess_cpp_suffix/.gitignore
new file mode 100644
index 0000000000..a007feab07
--- /dev/null
+++ b/example_packages/preprocess_cpp_suffix/.gitignore
@@ -0,0 +1 @@
+build/*
diff --git a/example_packages/preprocess_cpp_suffix/fpm.toml b/example_packages/preprocess_cpp_suffix/fpm.toml
new file mode 100644
index 0000000000..338fca42cf
--- /dev/null
+++ b/example_packages/preprocess_cpp_suffix/fpm.toml
@@ -0,0 +1,8 @@
+name = "preprocess_cpp"
+
+version = "1"
+
+[preprocess]
+[preprocess.cpp]
+macros = ["TESTMACRO", "TESTMACRO2=3", "TESTMACRO3={version}"]
+suffixes = ["fpp"]
diff --git a/example_packages/preprocess_cpp_suffix/src/preprocess_cpp.fpp b/example_packages/preprocess_cpp_suffix/src/preprocess_cpp.fpp
new file mode 100644
index 0000000000..d7ab5d1485
--- /dev/null
+++ b/example_packages/preprocess_cpp_suffix/src/preprocess_cpp.fpp
@@ -0,0 +1,22 @@
+module preprocess_cpp
+   implicit none
+   private
+
+   public :: say_hello
+contains
+   subroutine say_hello
+      print *, "Hello, preprocess_cpp!"
+#ifndef TESTMACRO
+      This breaks the build.
+#endif
+
+#if TESTMACRO2 != 3
+      This breaks the build.
+#endif
+
+#if TESTMACRO3 != 1
+      This breaks the build.
+#endif
+
+   end subroutine say_hello
+end module preprocess_cpp
diff --git a/src/fpm.f90 b/src/fpm.f90
index 0a2712e612..008d1af824 100644
--- a/src/fpm.f90
+++ b/src/fpm.f90
@@ -47,12 +47,14 @@ subroutine build_model(model, settings, package, error)
     logical :: has_cpp
     logical :: duplicates_found
     type(string_t) :: include_dir
+    type(string_t), allocatable :: preprocess_f_suffixes(:)
 
     model%package_name = package%name
 
     allocate(model%include_dirs(0))
     allocate(model%link_libraries(0))
     allocate(model%external_modules(0))
+    allocate(preprocess_f_suffixes(0))
 
     call new_compiler(model%compiler, settings%compiler, settings%c_compiler, &
         & settings%cxx_compiler, echo=settings%verbose, verbose=settings%verbose)
@@ -119,6 +121,9 @@ subroutine build_model(model, settings, package, error)
                         if (allocated(dependency%preprocess(j)%macros)) then
                             model%packages(i)%macros = [model%packages(i)%macros, dependency%preprocess(j)%macros]
                         end if
+                        if (allocated(dependency%preprocess(j)%suffixes)) then
+                            preprocess_f_suffixes = [preprocess_f_suffixes, dependency%preprocess(j)%suffixes]
+                        end if
                     else
                         write(stderr, '(a)') 'Warning: Preprocessor ' // package%preprocess(i)%name // &
                             ' is not supported; will ignore it'
@@ -134,6 +139,9 @@ subroutine build_model(model, settings, package, error)
                         if (allocated(dep%preprocess(j)%macros)) then
                             model%packages(i)%macros = [model%packages(i)%macros, dep%preprocess(j)%macros]
                         end if
+                        if (allocated(dependency%preprocess(j)%suffixes)) then
+                            preprocess_f_suffixes = [preprocess_f_suffixes, dependency%preprocess(j)%suffixes]
+                        end if
                     else
                         write(stderr, '(a)') 'Warning: Preprocessor ' // package%preprocess(i)%name // &
                             ' is not supported; will ignore it'
@@ -149,6 +157,7 @@ subroutine build_model(model, settings, package, error)
                     lib_dir = join_path(dep%proj_dir, dependency%library%source_dir)
                     if (is_dir(lib_dir)) then
                         call add_sources_from_dir(model%packages(i)%sources, lib_dir, FPM_SCOPE_LIB, &
+                            add_f_suffixes = preprocess_f_suffixes,&
                             error=error)
                         if (allocated(error)) exit
                     end if
@@ -187,6 +196,7 @@ subroutine build_model(model, settings, package, error)
     ! Add sources from executable directories
     if (is_dir('app') .and. package%build%auto_executables) then
         call add_sources_from_dir(model%packages(1)%sources,'app', FPM_SCOPE_APP, &
+                                   add_f_suffixes = preprocess_f_suffixes,&
                                    with_executables=.true., error=error)
 
         if (allocated(error)) then
@@ -196,6 +206,7 @@ subroutine build_model(model, settings, package, error)
     end if
     if (is_dir('example') .and. package%build%auto_examples) then
         call add_sources_from_dir(model%packages(1)%sources,'example', FPM_SCOPE_EXAMPLE, &
+                                   add_f_suffixes = preprocess_f_suffixes,&
                                    with_executables=.true., error=error)
 
         if (allocated(error)) then
@@ -205,6 +216,7 @@ subroutine build_model(model, settings, package, error)
     end if
     if (is_dir('test') .and. package%build%auto_tests) then
         call add_sources_from_dir(model%packages(1)%sources,'test', FPM_SCOPE_TEST, &
+                                   add_f_suffixes = preprocess_f_suffixes,&
                                    with_executables=.true., error=error)
 
         if (allocated(error)) then
@@ -215,6 +227,7 @@ subroutine build_model(model, settings, package, error)
     if (allocated(package%executable)) then
         call add_executable_sources(model%packages(1)%sources, package%executable, FPM_SCOPE_APP, &
                                      auto_discover=package%build%auto_executables, &
+                                     add_f_suffixes = preprocess_f_suffixes,&
                                      error=error)
 
         if (allocated(error)) then
@@ -225,6 +238,7 @@ subroutine build_model(model, settings, package, error)
     if (allocated(package%example)) then
         call add_executable_sources(model%packages(1)%sources, package%example, FPM_SCOPE_EXAMPLE, &
                                      auto_discover=package%build%auto_examples, &
+                                     add_f_suffixes = preprocess_f_suffixes,&
                                      error=error)
 
         if (allocated(error)) then
@@ -235,6 +249,7 @@ subroutine build_model(model, settings, package, error)
     if (allocated(package%test)) then
         call add_executable_sources(model%packages(1)%sources, package%test, FPM_SCOPE_TEST, &
                                      auto_discover=package%build%auto_tests, &
+                                     add_f_suffixes = preprocess_f_suffixes,&
                                      error=error)
 
         if (allocated(error)) then
diff --git a/src/fpm_sources.f90 b/src/fpm_sources.f90
index 0165249f50..b199067e36 100644
--- a/src/fpm_sources.f90
+++ b/src/fpm_sources.f90
@@ -8,7 +8,7 @@ module fpm_sources
 use fpm_model, only: srcfile_t, FPM_UNIT_PROGRAM
 use fpm_filesystem, only: basename, canon_path, dirname, join_path, list_files, is_hidden_file
 use fpm_environment, only: get_os_type,OS_WINDOWS
-use fpm_strings, only: lower, str_ends_with, string_t, operator(.in.)
+use fpm_strings, only: lower, str_ends_with, string_t, operator(.in.), split, string_cat
 use fpm_source_parsing, only: parse_f_source, parse_c_source
 use fpm_manifest_executable, only: executable_config_t
 implicit none
@@ -25,12 +25,15 @@ module fpm_sources
 
 !> Wrapper to source parsing routines.
 !> Selects parsing routine based on source file name extension
-function parse_source(source_file_path,error) result(source)
+function parse_source(source_file_path,add_f_suffixes,error) result(source)
     character(*), intent(in) :: source_file_path
+    character(*), intent(in) :: add_f_suffixes(:)
     type(error_t), allocatable, intent(out) :: error
     type(srcfile_t)  :: source
 
-    if (str_ends_with(lower(source_file_path), fortran_suffixes)) then
+    if (str_ends_with(lower(source_file_path), fortran_suffixes)&
+        .or.str_ends_with(source_file_path, add_f_suffixes)&
+       ) then
 
         source = parse_f_source(source_file_path, error)
 
@@ -51,7 +54,7 @@ function parse_source(source_file_path,error) result(source)
 end function parse_source
 
 !> Add to `sources` by looking for source files in `directory`
-subroutine add_sources_from_dir(sources,directory,scope,with_executables,recurse,error)
+subroutine add_sources_from_dir(sources,directory,scope,with_executables,recurse,add_f_suffixes,error)
     !> List of `[[srcfile_t]]` objects to append to. Allocated if not allocated
     type(srcfile_t), allocatable, intent(inout), target :: sources(:)
     !> Directory in which to search for source files
@@ -62,6 +65,8 @@ subroutine add_sources_from_dir(sources,directory,scope,with_executables,recurse
     logical, intent(in), optional :: with_executables
     !> Whether to recursively search subdirectories, default is `.true.`
     logical, intent(in), optional :: recurse
+    !> Additional suffixes
+    type(string_t), intent(in), optional :: add_f_suffixes(:)
     !> Error handling
     type(error_t), allocatable, intent(out) :: error
 
@@ -72,6 +77,7 @@ subroutine add_sources_from_dir(sources,directory,scope,with_executables,recurse
     type(string_t), allocatable :: src_file_names(:)
     type(string_t), allocatable :: existing_src_files(:)
     type(srcfile_t), allocatable :: dir_sources(:)
+    character(:), allocatable :: add_suffixes_(:)
 
     recurse_ = .true.
     if (present(recurse)) recurse_ = recurse
@@ -87,9 +93,12 @@ subroutine add_sources_from_dir(sources,directory,scope,with_executables,recurse
         allocate(existing_src_files(0))
     end if
 
+    call split(string_cat(add_f_suffixes, ' '), add_suffixes_, ' ')
+
     is_source = [(.not.(is_hidden_file(basename(file_names(i)%s))) .and. &
                  .not.(canon_path(file_names(i)%s) .in. existing_src_files) .and. &
                  (str_ends_with(lower(file_names(i)%s), fortran_suffixes) .or. &
+                 str_ends_with(file_names(i)%s, add_suffixes_) .or. &
                  str_ends_with(lower(file_names(i)%s), c_suffixes) ),i=1,size(file_names))]
     src_file_names = pack(file_names,is_source)
 
@@ -98,7 +107,7 @@ subroutine add_sources_from_dir(sources,directory,scope,with_executables,recurse
 
     do i = 1, size(src_file_names)
 
-        dir_sources(i) = parse_source(src_file_names(i)%s,error)
+        dir_sources(i) = parse_source(src_file_names(i)%s,add_suffixes_,error)
         if (allocated(error)) return
 
         dir_sources(i)%unit_scope = scope
@@ -129,7 +138,7 @@ end subroutine add_sources_from_dir
 !> Add to `sources` using the executable and test entries in the manifest and
 !> applies any executable-specific overrides such as `executable%name`.
 !> Adds all sources (including modules) from each `executable%source_dir`
-subroutine add_executable_sources(sources,executables,scope,auto_discover,error)
+subroutine add_executable_sources(sources,executables,scope,auto_discover,add_f_suffixes,error)
     !> List of `[[srcfile_t]]` objects to append to. Allocated if not allocated
     type(srcfile_t), allocatable, intent(inout), target :: sources(:)
     !> List of `[[executable_config_t]]` entries from manifest
@@ -138,6 +147,8 @@ subroutine add_executable_sources(sources,executables,scope,auto_discover,error)
     integer, intent(in) :: scope
     !> If `.false.` only executables and tests specified in the manifest are added to `sources`
     logical, intent(in) :: auto_discover
+    !> Additional suffixes
+    type(string_t), intent(in), optional :: add_f_suffixes(:)
     !> Error handling
     type(error_t), allocatable, intent(out) :: error
 
@@ -145,18 +156,21 @@ subroutine add_executable_sources(sources,executables,scope,auto_discover,error)
 
     type(string_t), allocatable :: exe_dirs(:)
     type(srcfile_t) :: exe_source
+    character(:), allocatable :: add_suffixes_(:)
 
     call get_executable_source_dirs(exe_dirs,executables)
 
     do i=1,size(exe_dirs)
         call add_sources_from_dir(sources,exe_dirs(i)%s, scope, &
-                     with_executables=auto_discover, recurse=.false., error=error)
+                     with_executables=auto_discover, recurse=.false., add_f_suffixes = add_f_suffixes, error=error)
 
         if (allocated(error)) then
             return
         end if
     end do
 
+    call split(string_cat(add_f_suffixes, ' '), add_suffixes_, ' ')
+
     exe_loop: do i=1,size(executables)
 
         ! Check if executable already discovered automatically
@@ -180,7 +194,7 @@ subroutine add_executable_sources(sources,executables,scope,auto_discover,error)
 
         ! Add if not already discovered (auto_discovery off)
         associate(exe => executables(i))
-            exe_source = parse_source(join_path(exe%source_dir,exe%main),error)
+            exe_source = parse_source(join_path(exe%source_dir,exe%main),add_suffixes_,error)
             exe_source%exe_name = exe%name
             if (allocated(exe%link)) then
                 exe_source%link_libraries = exe%link