diff --git a/scripts/bashrc-nix.sh b/scripts/bashrc-nix.sh
index cc4ebf5..b0c5b9e 100644
--- a/scripts/bashrc-nix.sh
+++ b/scripts/bashrc-nix.sh
@@ -12,7 +12,8 @@ nix-git-update() {
         update-nix-fetchgit *.nix
         
         # If there are changes after updating
-        if git diff-index --quiet HEAD --; then
+        if ! git diff-index --quiet HEAD --; then
+            # Has changes
             rebuild-gc
             git add *.nix
             git commit -m "[U] Update fetchgit refs"