diff --git a/tools/osbuild-dev b/tools/osbuild-dev
index 1c0dd321..1012e970 100755
--- a/tools/osbuild-dev
+++ b/tools/osbuild-dev
@@ -227,7 +227,7 @@ def pretty_diff(
 
             paths.append(path)
 
-        subprocess.run((["diff", "-u"] if simple else ["vimdiff"]) + paths)
+        subprocess.run((["diff", "-u"] if simple else ["vimdiff"]) + paths, check=True)
 
     return 0