diff --git a/Makefile b/Makefile
index e2f733bf6..98e3a4f52 100644
--- a/Makefile
+++ b/Makefile
@@ -33,9 +33,9 @@ idle:
 	${MAKE} -C src/common all;
 
 clean:
-	find . -name *.pyc -exec rm {} \;
-	find . -name *.pyo -exec rm {} \;
-	find . -name *.mo -exec rm {} \;
+	find . -name '*.pyc' -exec rm {} \;
+	find . -name '*.pyo' -exec rm {} \;
+	find . -name '*.mo' -exec rm {} \;
 	$(foreach sdir, $(MODULES), ${MAKE} -C $(sdir) clean;)
 
 dist: