diff --git a/contrib/gana-update.sh b/contrib/gana-update.sh
index 80830eb7d..121980273 100755
--- a/contrib/gana-update.sh
+++ b/contrib/gana-update.sh
@@ -23,6 +23,7 @@ ensure ()
     if ! diff $src/$fn $dst/$fn > /dev/null
     then
         cp $src/$fn $dst/$fn
+        chmod -w $dst/$fn
     fi
 }