diff --git a/Makefile b/Makefile
index 5b9a801..d28732f 100644
--- a/Makefile
+++ b/Makefile
@@ -5,7 +5,7 @@ all:
 clean:
 	find . -name "*.rkt~" -type f -exec rm -f {} \;
 	find . -name "*.scrbl~" -type f -exec rm -f {} \;
-	find . -name "compiled" -type d -exec rm -rf {} \;
+	DIRS=`find . -name "compiled" -type d`;rm -rf $$DIRS
 	find scrbl -name "*.html" -type f -exec rm {} \;
 	find scrbl -name "*.css" -type f -exec rm {} \;
 	find scrbl -name "*.js" -type f -exec rm {} \;