diff --git a/cpp/src/arrow/meson.build b/cpp/src/arrow/meson.build
index 43050aa15977..48d01db729d7 100644
--- a/cpp/src/arrow/meson.build
+++ b/cpp/src/arrow/meson.build
@@ -192,6 +192,7 @@ arrow_util_srcs = [
     'util/float16.cc',
     'util/formatting.cc',
     'util/future.cc',
+    'util/fuzz_internal.cc',
     'util/hashing.cc',
     'util/int_util.cc',
     'util/io_util.cc',
diff --git a/cpp/src/parquet/meson.build b/cpp/src/parquet/meson.build
index e6ff43a0baee..a75a1b94d08e 100644
--- a/cpp/src/parquet/meson.build
+++ b/cpp/src/parquet/meson.build
@@ -17,6 +17,7 @@
 
 parquet_srcs = files(
     '../generated/parquet_types.cpp',
+    'arrow/fuzz_internal.cc',
     'arrow/path_internal.cc',
     'arrow/reader.cc',
     'arrow/reader_internal.cc',