diff --git a/BaseTools/Conf/tools_def.template b/BaseTools/Conf/tools_def.template
index da6bcabf48..541d60d1bc 100644
--- a/BaseTools/Conf/tools_def.template
+++ b/BaseTools/Conf/tools_def.template
@@ -407,7 +407,7 @@ RELEASE_WINDDK3790x1830_IPF_DLINK_FLAGS  = /NOLOGO /NODEFAULTLIB /LTCG /DLL /OPT
 *_UNIXGCC_*_*_FAMILY               = GCC
 
 *_UNIXGCC_*_DLINK_FLAGS                  = -nostdlib -O2 --gc-sections --dll --export-all-symbols --entry _$(ENTRYPOINT) --file-alignment 0x20 --section-alignment 0x20
-*_UNIXGCC_*_ASM_FLAGS                    = -c -imacros $(DEST_DIR_DEBUG)/AutoGen.h
+*_UNIXGCC_*_ASM_FLAGS                    = -c -x assembler -imacros $(DEST_DIR_DEBUG)/AutoGen.h
 *_UNIXGCC_*_PP_FLAGS                     = -E -x assembler-with-cpp -include $(DEST_DIR_DEBUG)/AutoGen.h
 *_UNIXGCC_*_VFRPP_FLAGS                  = -x c -E -P -DVFRCOMPILE --include AutoGen.h
 *_UNIXGCC_*_MAKE_PATH                    = make