diff --git a/libsrc/c128/.cvsignore b/libsrc/c128/.cvsignore
index 581e5ff62..3eecd7b49 100644
--- a/libsrc/c128/.cvsignore
+++ b/libsrc/c128/.cvsignore
@@ -1,4 +1,5 @@
 *.emd
 *.joy
+*.mou
 *.ser
 *.tgi