diff --git a/pkgs/by-name/sm/smlfut/package.nix b/pkgs/by-name/sm/smlfut/package.nix
index 21938595b301..323f3ca6c3f3 100644
--- a/pkgs/by-name/sm/smlfut/package.nix
+++ b/pkgs/by-name/sm/smlfut/package.nix
@@ -7,15 +7,15 @@
   futhark,
 }:
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: {
   pname = "smlfut";
-  version = "1.6.2";
+  version = "1.6.4";
 
   src = fetchFromGitHub {
     owner = "diku-dk";
     repo = "smlfut";
-    rev = "v${version}";
-    hash = "sha256-0Bqgoyp43Y961BMghJFBUx+1lcM2HHlPDjPyLHquWiE=";
+    rev = "v${finalAttrs.version}";
+    hash = "sha256-xICcobdvSdHZfNxz4WRDOsaL4JGFRK7LmhMzKOZY5FY=";
   };
 
   enableParallelBuilding = true;
@@ -43,4 +43,4 @@ stdenv.mkDerivation rec {
     maintainers = with maintainers; [ athas ];
     mainProgram = "smlfut";
   };
-}
+})