diff --git a/flang/runtime/CMakeLists.txt b/flang/runtime/CMakeLists.txt
index 7cc720e2df9af..f651ea83664eb 100644
--- a/flang/runtime/CMakeLists.txt
+++ b/flang/runtime/CMakeLists.txt
@@ -189,6 +189,8 @@ include(AddFlangOffloadRuntime)
 
 # List of files that are buildable for all devices.
 set(supported_files
+  ${FLANG_SOURCE_DIR}/lib/Decimal/binary-to-decimal.cpp
+  ${FLANG_SOURCE_DIR}/lib/Decimal/decimal-to-binary.cpp
   ISO_Fortran_binding.cpp
   allocatable.cpp
   allocator-registry.cpp