diff --git a/src/mzscheme/Makefile.in b/src/mzscheme/Makefile.in
index 405c421f25..6061b8c899 100644
--- a/src/mzscheme/Makefile.in
+++ b/src/mzscheme/Makefile.in
@@ -241,8 +241,8 @@ clean@NOT_OSX@:
 	cd sgc; $(MAKE) clean
 	cd src; $(MAKE) clean
 	cd dynsrc; $(MAKE) clean
-	if [ ! -d ../foreign ] ; then cd ../foreign ; $(MAKE) clean ; fi
-	if [ ! -d ../llvm    ] ; then cd ../llvm    ; $(MAKE) clean ; fi
+	if [ -d ../foreign ] ; then cd ../foreign ; $(MAKE) clean ; fi
+	if [ -d ../llvm    ] ; then cd ../llvm    ; $(MAKE) clean ; fi
 
 clean@OSX@:
 	rm -rf PLT_MzScheme.framework