diff --git a/preprocessor/Makefile.am b/preprocessor/Makefile.am
index 892b2b178..5a8ac507e 100644
--- a/preprocessor/Makefile.am
+++ b/preprocessor/Makefile.am
@@ -86,7 +86,7 @@ html-local:
 endif
 
 clean-local:
-	rm -rf ../matlab/preprocessor*
+	rm -rf ../matlab/preprocessor* ../julia/preprocessor*
 	rm -rf doc/html/
 
 EXTRA_DIST = $(BUILT_SOURCES) Doxyfile