diff --git a/pkgs/data/themes/sierra/default.nix b/pkgs/data/themes/sierra/default.nix
index d7c512cde474..e87f64661419 100644
--- a/pkgs/data/themes/sierra/default.nix
+++ b/pkgs/data/themes/sierra/default.nix
@@ -48,7 +48,7 @@ stdenv.mkDerivation {
   installPhase = ''
     runHook preInstall
 
-    patchShebangs .
+    patchShebangs install.sh
 
     mkdir -p $out/share/themes
     name= ./install.sh --dest $out/share/themes \