diff --git a/Makefile b/Makefile
index a8f2df63..bba6a997 100644
--- a/Makefile
+++ b/Makefile
@@ -106,7 +106,7 @@ clean-dist:
 clean-libs:
 	rm -frv dist/libraries build/lib
 clean-octopus:
-	cd src && git clean -fdx
+	cd src && git clean -fdX
 
 git-checkout:
 	git submodule sync --recursive && \