diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index e80a33743a9..58817326f45 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -3539,7 +3539,7 @@ let
         cxx = false;
       };
 
-  gmpxx = gmp.override { cxx = true; };
+  gmpxx = appendToName "with-cxx" (gmp.override { cxx = true; });
 
   gobjectIntrospection = callPackage ../development/libraries/gobject-introspection { };