diff --git a/pkgs/build-support/trivial-builders.nix b/pkgs/build-support/trivial-builders.nix
index b02afb37943..a7120e33433 100644
--- a/pkgs/build-support/trivial-builders.nix
+++ b/pkgs/build-support/trivial-builders.nix
@@ -380,7 +380,7 @@ rec {
    * concatScript "my-file" [ file1 file2 ]
    *
   */
-  concatScript = name: files: concatTextFile { inherit name files; executable=true; };
+  concatScript = name: files: concatTextFile { inherit name files; executable = true; };
 
 
   /*