diff --git a/pkgs/development/tools/misc/gnum4/default.nix b/pkgs/development/tools/misc/gnum4/default.nix
index a69c7f41751..db5b8cbef77 100644
--- a/pkgs/development/tools/misc/gnum4/default.nix
+++ b/pkgs/development/tools/misc/gnum4/default.nix
@@ -4,7 +4,7 @@ stdenv.mkDerivation rec {
   name = "gnum4-1.4.17";
 
   src = fetchurl {
-    url = "mirror://gnu/m4/${name}.tar.bz2";
+    url = "mirror://gnu/m4/m4-1.4.17.tar.bz2";
     sha256 = "0w0da1chh12mczxa5lnwzjk9czi3dq6gnnndbpa6w4rj76b1yklf";
   };