diff --git a/pkgs/applications/video/mkvtoolnix/default.nix b/pkgs/applications/video/mkvtoolnix/default.nix
index 04ddbbb8c06..af917981e1c 100644
--- a/pkgs/applications/video/mkvtoolnix/default.nix
+++ b/pkgs/applications/video/mkvtoolnix/default.nix
@@ -50,6 +50,8 @@ stdenv.mkDerivation rec {
     (enableFeature withGUI "qt")
   ];
 
+  CXXFLAGS = optional stdenv.cc.isClang "-std=c++14";
+
   dontWrapQtApps = true;
   postFixup = optionalString withGUI ''
     wrapQtApp $out/bin/mkvtoolnix-gui