diff --git a/pkgs/development/libraries/gecode/default.nix b/pkgs/development/libraries/gecode/default.nix
index fc9835d85db..fe13c893480 100644
--- a/pkgs/development/libraries/gecode/default.nix
+++ b/pkgs/development/libraries/gecode/default.nix
@@ -1,4 +1,15 @@
-{ lib, stdenv, fetchFromGitHub, bison, flex, perl, gmp, mpfr, enableGist ? true, qtbase }:
+{ lib
+, stdenv
+, fetchFromGitHub
+, fetchpatch
+, bison
+, flex
+, perl
+, gmp
+, mpfr
+, qtbase
+, enableGist ? true
+}:
 
 stdenv.mkDerivation rec {
   pname = "gecode";
@@ -11,6 +22,15 @@ stdenv.mkDerivation rec {
     sha256 = "0b1cq0c810j1xr2x9y9996p894571sdxng5h74py17c6nr8c6dmk";
   };
 
+  patches = [
+    # https://github.com/Gecode/gecode/pull/74
+    (fetchpatch {
+      name = "fix-const-weights-clang.patch";
+      url = "https://github.com/Gecode/gecode/commit/c810c96b1ce5d3692e93439f76c4fa7d3daf9fbb.patch";
+      sha256 = "0270msm22q5g5sqbdh8kmrihlxnnxqrxszk9a49hdxd72736p4fc";
+    })
+  ];
+
   enableParallelBuilding = true;
   dontWrapQtApps = true;
   nativeBuildInputs = [ bison flex ];