diff --git a/pkgs/development/tools/gotools/default.nix b/pkgs/development/tools/gotools/default.nix
index 59416f031346..430f17bfb5b0 100644
--- a/pkgs/development/tools/gotools/default.nix
+++ b/pkgs/development/tools/gotools/default.nix
@@ -40,9 +40,8 @@ buildGoModule rec {
   # Set GOTOOLDIR for derivations adding this to buildInputs
   postInstall = ''
     mkdir -p $out/nix-support
-    substituteAll ${../../go-modules/tools/setup-hook.sh} $out/nix-support/setup-hook.tmp
-    cat $out/nix-support/setup-hook.tmp >> $out/nix-support/setup-hook
-    rm $out/nix-support/setup-hook.tmp
+    substitute ${../../go-modules/tools/setup-hook.sh} $out/nix-support/setup-hook \
+      --subst-var-by bin $out
   '';
 
   # Do not copy this without a good reason for enabling