diff --git a/Makefile b/Makefile
index ae68ad6..14139a2 100644
--- a/Makefile
+++ b/Makefile
@@ -2,5 +2,8 @@ build:
 	mkdir -p output
 	zip -r -FS output/bugzillajs.xpi js css icon.png icon64.png manifest.json
 
+clean:
+	mkdir -p output && rm -R output/
+
 lint:
 	jshint .