diff --git a/pkgs/development/libraries/microsoft_gsl/default.nix b/pkgs/development/libraries/microsoft_gsl/default.nix
index 187508a9981..35765ff2d43 100644
--- a/pkgs/development/libraries/microsoft_gsl/default.nix
+++ b/pkgs/development/libraries/microsoft_gsl/default.nix
@@ -3,7 +3,7 @@
 , fetchFromGitHub
 , cmake
 , gtest
-, fetchurl
+, fetchpatch
 , pkg-config
 }:
 
@@ -20,9 +20,9 @@ stdenv.mkDerivation rec {
 
   patches = [
     # Search for GoogleTest via pkg-config first, ref: https://github.com/NixOS/nixpkgs/pull/130525
-    (fetchurl {
+    (fetchpatch {
       url = "https://github.com/microsoft/GSL/commit/f5cf01083baf7e8dc8318db3648bc6098dc32d67.patch";
-      sha256 = "sha256-uouv35crtly8kYhKyvMyZkqwTKt1jXC6dZjw4sQ6uv0=";
+      sha256 = "sha256-HJxG87nVFo1CGNivCqt/JhjTj2xLzQe8bF5Km7/KG+Y=";
     })
   ];