diff --git a/GNUmakefile b/GNUmakefile
index e5536665..c5fb6767 100755
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -1169,7 +1169,7 @@ TESTIMPORTOBJS := $(TESTOBJS:.o=.import.o)
 DLLTESTOBJS := dlltest.dllonly.o
 
 # Clean recipe, Issue 998. Don't filter-out some artifacts from the list of objects
-CLEAN_SRCS := $(wildcard *.cpp)
+CLEAN_SRCS := $(wildcard *.cpp) $(wildcard *.S)
 CLEAN_OBJS := $(CLEAN_SRCS:.cpp=.o) $(CLEAN_SRCS:.cpp=.import.o) $(CLEAN_SRCS:.cpp=.export.o)
 
 ###########################################################
diff --git a/GNUmakefile-cross b/GNUmakefile-cross
index 8eb0f4f5..07176c65 100755
--- a/GNUmakefile-cross
+++ b/GNUmakefile-cross
@@ -677,7 +677,7 @@ TESTOBJS := $(TESTSRCS:.cpp=.o)
 LIBOBJS := $(filter-out $(TESTOBJS),$(OBJS))
 
 # Clean recipe, Issue 998. Don't filter-out some artifacts from the list of objects
-CLEAN_SRCS := $(wildcard *.cpp)
+CLEAN_SRCS := $(wildcard *.cpp) $(wildcard *.S)
 CLEAN_OBJS := $(CLEAN_SRCS:.cpp=.o) $(CLEAN_SRCS:.cpp=.import.o) $(CLEAN_SRCS:.cpp=.export.o)
 
 # For Shared Objects, Diff, Dist/Zip rules