diff --git a/pkgs/applications/science/math/gap/default.nix b/pkgs/applications/science/math/gap/default.nix
index a2432e9827c..04a49becc97 100644
--- a/pkgs/applications/science/math/gap/default.nix
+++ b/pkgs/applications/science/math/gap/default.nix
@@ -73,8 +73,6 @@ stdenv.mkDerivation rec {
     patchShebangs .
   '';
 
-  configureFlags = [ "--with-gmp=system" ];
-
   buildInputs = [
     readline
     gmp