diff --git a/pkgs/tools/X11/xdragon/default.nix b/pkgs/tools/X11/xdragon/default.nix
index 7061a8f0a1cf..9f12a78e2936 100644
--- a/pkgs/tools/X11/xdragon/default.nix
+++ b/pkgs/tools/X11/xdragon/default.nix
@@ -1,14 +1,14 @@
 { lib, stdenv, fetchFromGitHub, pkg-config, gtk3 }:
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: {
   pname = "xdragon";
   version = "1.2.0";
 
   src = fetchFromGitHub {
     owner = "mwh";
     repo = "dragon";
-    rev = "v${version}";
-    sha256 = "sha256-wqG6idlVvdN+sPwYgWu3UL0la5ssvymZibiak3KeV7M=";
+    rev = "v${finalAttrs.version}";
+    hash = "sha256-wqG6idlVvdN+sPwYgWu3UL0la5ssvymZibiak3KeV7M=";
   };
 
   nativeBuildInputs = [ pkg-config ];
@@ -24,5 +24,6 @@ stdenv.mkDerivation rec {
     homepage = "https://github.com/mwh/dragon";
     license = licenses.gpl3;
     maintainers = with maintainers; [ das_j ];
+    mainProgram = "xdragon";
   };
-}
+})