diff --git a/refdoc/Makefile b/refdoc/Makefile
index 7c2059c0a9df56eec6995302ce5306198f4c3632..d2d23d2de5c1892076cade32fb9dfdda86268fa4 100644
--- a/refdoc/Makefile
+++ b/refdoc/Makefile
@@ -116,4 +116,4 @@ touch-mirardoc:
 # Cleanup
 
 clean:
-	-rm modref onepage traditional_manual pelix_modref autodoc.xml
+	-rm -r modref onepage traditional_manual pelix_modref autodoc.xml