diff --git a/pkgs/development/libraries/mpir/default.nix b/pkgs/development/libraries/mpir/default.nix
index feb110f7eab2..5e68ad80fc2e 100644
--- a/pkgs/development/libraries/mpir/default.nix
+++ b/pkgs/development/libraries/mpir/default.nix
@@ -11,7 +11,7 @@ stdenv.mkDerivation rec {
     sha256 = "1fvmhrqdjs925hzr2i8bszm50h00gwsh17p2kn2pi51zrxck9xjj";
   };
 
-  configureFlags = [ "--enable-cxx --enable-fat" ];
+  configureFlags = [ "--enable-cxx" "--enable-fat" ];
 
   meta = {
     inherit version;