diff --git a/pkgs/build-support/cc-wrapper/add-flags b/pkgs/build-support/cc-wrapper/add-flags.sh
similarity index 100%
rename from pkgs/build-support/cc-wrapper/add-flags
rename to pkgs/build-support/cc-wrapper/add-flags.sh
diff --git a/pkgs/build-support/cc-wrapper/add-hardening b/pkgs/build-support/cc-wrapper/add-hardening.sh
similarity index 100%
rename from pkgs/build-support/cc-wrapper/add-hardening
rename to pkgs/build-support/cc-wrapper/add-hardening.sh
diff --git a/pkgs/build-support/cc-wrapper/default.nix b/pkgs/build-support/cc-wrapper/default.nix
index 14ece26f6af0..10bd5f77f72d 100644
--- a/pkgs/build-support/cc-wrapper/default.nix
+++ b/pkgs/build-support/cc-wrapper/default.nix
@@ -237,8 +237,8 @@ stdenv.mkDerivation {
       cat $out/nix-support/setup-hook.tmp >> $out/nix-support/setup-hook
       rm $out/nix-support/setup-hook.tmp
 
-      substituteAll ${./add-flags} $out/nix-support/add-flags.sh
-      cp -p ${./add-hardening} $out/nix-support/add-hardening.sh
+      substituteAll ${./add-flags.sh} $out/nix-support/add-flags.sh
+      cp -p ${./add-hardening.sh} $out/nix-support/add-hardening.sh
       cp -p ${./utils.sh} $out/nix-support/utils.sh
     ''
     + extraBuildCommands;