diff --git a/make/rules.mk b/make/rules.mk
index 54c4ad81..34557fb3 100644
--- a/make/rules.mk
+++ b/make/rules.mk
@@ -135,7 +135,7 @@ cvsupdate update:
 	if [ -d "CVS" ]; then cvs update -dP || exit 1; else git pull || exit 1; fi
 
 cvsdiff diff:
-	if [ -d "CVS" ]; then cvs diff -u || exit 1; else git --no-pager diff || exit 1; fi
+	if [ -d "CVS" ]; then cvs diff -u || exit 1; else git --no-pager diff --relative --no-prefix . || exit 1; fi
 
 push:
 	if [ ! -d "CVS" ]; then git push || exit 1; fi