diff --git a/pkgs/applications/version-management/qgit/default.nix b/pkgs/applications/version-management/qgit/default.nix
index 98a0bb68ae13..51543610833d 100644
--- a/pkgs/applications/version-management/qgit/default.nix
+++ b/pkgs/applications/version-management/qgit/default.nix
@@ -14,4 +14,5 @@ stdenv.mkDerivation rec {
     sha256 = "0qmgd1cjny5aciljpvn2bczgdvlpgd2f7wzafda24zj4mzqnppsq";
   };
   buildInputs = [qt libXext libX11];
+  configureFlags = "CXXFLAGS=-O3";
 }