diff --git a/pkgs/development/interpreters/j/default.nix b/pkgs/development/interpreters/j/default.nix
index 8e6b434281eb..0ac66d0ca97a 100644
--- a/pkgs/development/interpreters/j/default.nix
+++ b/pkgs/development/interpreters/j/default.nix
@@ -5,12 +5,12 @@
 stdenv.mkDerivation rec {
   pname = "j";
   version = "901";
-  jtype = "release-e";
+  jtype = "release-f";
   src = fetchFromGitHub {
     owner = "jsoftware";
     repo = "jsource";
     rev = "j${version}-${jtype}";
-    sha256 = "13ky37rrl6mc66fckrdnrw64gmvq1qlv6skzd513lab4d0wigshw";
+    sha256 = "1776021m0j1aanzwg60by83n53pw7i6afd5wplfzczwk8bywax4p";
     name = "jsource";
   };