diff --git a/pkgs/development/libraries/qt-5/5.12/default.nix b/pkgs/development/libraries/qt-5/5.12/default.nix
index c0bba5e5c01..19126012003 100644
--- a/pkgs/development/libraries/qt-5/5.12/default.nix
+++ b/pkgs/development/libraries/qt-5/5.12/default.nix
@@ -74,6 +74,11 @@ let
           url = "https://code.qt.io/cgit/qt/qtbase.git/patch/?id=8a3fde00bf53d99e9e4853e8ab97b0e1bcf74915";
           sha256 = "1gpcbdpyazdxnmldvhsf3pfwr2gjvi08x3j6rxf543rq01bp6cpx";
         })
+        (fetchpatch {
+          name = "QTBUG-78937.patch";
+          url = "https://code.qt.io/cgit/qt/qtbase.git/patch/?id=67a9c600ad14ee44501a6df3509daa8234b97606";
+          sha256 = "1jiky1w9j8rka78r4q0yabb8w2l5j6csdjysynz7gs1ry4xjfdxd";
+        })
       ];
     qtdeclarative = [ ./qtdeclarative.patch ];
     qtscript = [ ./qtscript.patch ];