diff --git a/pkgs/build-support/trivial-builders.nix b/pkgs/build-support/trivial-builders.nix
index 9664abeb465..d092efb556e 100644
--- a/pkgs/build-support/trivial-builders.nix
+++ b/pkgs/build-support/trivial-builders.nix
@@ -170,6 +170,7 @@ rec {
         ***
 
         _EOF_
+        exit 1
       '';
     };