diff --git a/pkgs/by-name/gl/glslls/package.nix b/pkgs/by-name/gl/glslls/package.nix
index e09a9bc35e6c..a8db204b1090 100644
--- a/pkgs/by-name/gl/glslls/package.nix
+++ b/pkgs/by-name/gl/glslls/package.nix
@@ -19,6 +19,11 @@ stdenv.mkDerivation (finalAttrs: {
     hash = "sha256-wi1QiqaWRh1DmIhwmu94lL/4uuMv6DnB+whM61Jg1Zs=";
   };
 
+  # Fix build with GCC 15
+  postPatch = ''
+    sed -i "1i #include <cstdint>" externals/glslang/SPIRV/SpvBuilder.h
+  '';
+
   nativeBuildInputs = [
     python3
     cmake