diff --git a/pkgs/development/libraries/gecode/3.nix b/pkgs/development/libraries/gecode/3.nix
index 3cf5d590fa83..36c7120ac609 100644
--- a/pkgs/development/libraries/gecode/3.nix
+++ b/pkgs/development/libraries/gecode/3.nix
@@ -1,4 +1,9 @@
-{ lib, stdenv, fetchurl, perl }:
+{ lib
+, stdenv
+, fetchurl
+, fetchpatch
+, perl
+}:
 
 stdenv.mkDerivation rec {
   pname = "gecode";
@@ -9,6 +14,10 @@ stdenv.mkDerivation rec {
     sha256 = "0k45jas6p3cyldgyir1314ja3174sayn2h2ly3z9b4dl3368pk77";
   };
 
+  patches = [
+    (import ./fix-const-weights-clang-patch.nix fetchpatch)
+  ];
+
   nativeBuildInputs = [ perl ];
 
   preConfigure = "patchShebangs configure";
diff --git a/pkgs/development/libraries/gecode/default.nix b/pkgs/development/libraries/gecode/default.nix
index fe13c893480c..57bac2295139 100644
--- a/pkgs/development/libraries/gecode/default.nix
+++ b/pkgs/development/libraries/gecode/default.nix
@@ -23,12 +23,7 @@ stdenv.mkDerivation rec {
   };
 
   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";
-    })
+    (import ./fix-const-weights-clang-patch.nix fetchpatch)
   ];
 
   enableParallelBuilding = true;
diff --git a/pkgs/development/libraries/gecode/fix-const-weights-clang-patch.nix b/pkgs/development/libraries/gecode/fix-const-weights-clang-patch.nix
new file mode 100644
index 000000000000..77160283afee
--- /dev/null
+++ b/pkgs/development/libraries/gecode/fix-const-weights-clang-patch.nix
@@ -0,0 +1,7 @@
+fetchpatch:
+# 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";
+})