diff --git a/src/main/java/com/google/devtools/build/lib/rules/cpp/CcModule.java b/src/main/java/com/google/devtools/build/lib/rules/cpp/CcModule.java
index 33c3d7943f0f03..a4243f0949dc96 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/cpp/CcModule.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/cpp/CcModule.java
@@ -1979,8 +1979,13 @@ protected Tuple compile(
     validateExtensions(
         "srcs",
         sources,
-        CppFileTypes.ALL_C_CLASS_SOURCE.including(CppFileTypes.ASSEMBLER),
-        FileTypeSet.of(CppFileTypes.CPP_SOURCE, CppFileTypes.C_SOURCE, CppFileTypes.ASSEMBLER));
+        CppFileTypes.ALL_C_CLASS_SOURCE.including(
+            CppFileTypes.ASSEMBLER_WITH_C_PREPROCESSOR, CppFileTypes.ASSEMBLER),
+        FileTypeSet.of(
+            CppFileTypes.CPP_SOURCE,
+            CppFileTypes.C_SOURCE,
+            CppFileTypes.ASSEMBLER_WITH_C_PREPROCESSOR,
+            CppFileTypes.ASSEMBLER));
     validateExtensions(
         "public_hdrs",
         publicHeaders,