diff --git a/test_problems/silane_equil/Makefile.in b/test_problems/silane_equil/Makefile.in
index 3c4107181..229dd80c5 100644
--- a/test_problems/silane_equil/Makefile.in
+++ b/test_problems/silane_equil/Makefile.in
@@ -104,17 +104,7 @@ endif
 clean:
 	$(RM) $(OBJS) $(PROGRAM) $(DEPENDS) .depends
 	../../bin/rm_cvsignore
-
-
-
-
-
-
-
-
-
-
-
-
-
+	(if test -d SunWS_cache ; then \
+           $(RM) -rf SunWS_cache ; \
+         fi )