diff --git a/doc/doxygen/Makefile b/doc/doxygen/Makefile
index 2363ff6d8e..9dad5f4932 100644
--- a/doc/doxygen/Makefile
+++ b/doc/doxygen/Makefile
@@ -2,4 +2,4 @@ doc:
 	doxygen riot.doxyfile
 
 clean:
-	@rm -rf latex man html
+	-@rm -rf latex man html