diff --git a/pkgs/applications/audio/munt/mt32emu-smf2wav.nix b/pkgs/applications/audio/munt/mt32emu-smf2wav.nix
index 378b5dd8fb83..eee9f01ebb55 100644
--- a/pkgs/applications/audio/munt/mt32emu-smf2wav.nix
+++ b/pkgs/applications/audio/munt/mt32emu-smf2wav.nix
@@ -7,15 +7,18 @@
 , pkg-config
 }:
 
+let
+  char2underscore = char: str: lib.replaceChars [ char ] [ "_" ] str;
+in
 stdenv.mkDerivation rec {
   pname = "mt32emu-smf2wav";
-  version = "1.7.0";
+  version = "1.8.2";
 
   src = fetchFromGitHub {
     owner = "munt";
     repo = "munt";
-    rev = "mt32emu_smf2wav_${lib.replaceChars [ "." ] [ "_" ] version}";
-    hash = "sha256-FnKlKJxe7P4Yqpv0oVGgV4253dMgSmgtb7EAa2FI+aI=";
+    rev = "${char2underscore "-" pname}_${char2underscore "." version}";
+    sha256 = "1dh5xpnsgx367ch45mm5c2p26vnxf3shax2afg2cd2lrbrlii7l9";
   };
 
   postPatch = ''
@@ -45,6 +48,5 @@ stdenv.mkDerivation rec {
     license = with licenses; [ gpl3Plus ];
     maintainers = with maintainers; [ OPNA2608 ];
     platforms = platforms.all;
-    mainProgram = "mt32emu-smf2wav";
   };
 }