diff --git a/pkgs/applications/video/mkvtoolnix/default.nix b/pkgs/applications/video/mkvtoolnix/default.nix
index 32c1e4a9f637..4ad3a6603dea 100644
--- a/pkgs/applications/video/mkvtoolnix/default.nix
+++ b/pkgs/applications/video/mkvtoolnix/default.nix
@@ -127,6 +127,7 @@ stdenv.mkDerivation rec {
     description = "Cross-platform tools for Matroska";
     homepage = "https://mkvtoolnix.download/";
     license = licenses.gpl2Only;
+    mainProgram = if withGUI then "mkvtoolnix-gui" else "mkvtoolnix";
     maintainers = with maintainers; [ codyopel rnhmjoj ];
     platforms = platforms.unix;
   };