diff --git a/pkgs/development/libraries/mlt/default.nix b/pkgs/development/libraries/mlt/default.nix
index cb7a438c8a8f..89187f58b594 100644
--- a/pkgs/development/libraries/mlt/default.nix
+++ b/pkgs/development/libraries/mlt/default.nix
@@ -115,7 +115,7 @@ stdenv.mkDerivation rec {
   ] ++ lib.optionals (qt != null) [
     "-DMOD_QT${lib.versions.major qt.qtbase.version}=ON"
   ] ++ lib.optionals enableGlaxnimate [
-    "-DMOD_GLAXNIMATE=ON"
+    "-DMOD_GLAXNIMATE${if lib.versions.major qt.qtbase.version == "5" then "" else "_QT6"}=ON"
   ];
 
   preFixup = ''