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-rw-r--r--pkgs/servers/mail/postfix/default.nix4
1 files changed, 2 insertions, 2 deletions
diff --git a/pkgs/servers/mail/postfix/default.nix b/pkgs/servers/mail/postfix/default.nix
index 155d534c7475..37a3869a733f 100644
--- a/pkgs/servers/mail/postfix/default.nix
+++ b/pkgs/servers/mail/postfix/default.nix
@@ -4,11 +4,11 @@
 
 assert stdenv.isLinux;
 
-stdenv.mkDerivation {
+stdenv.mkDerivation rec {
   name = "postfix-2.8.6";
 
   src = fetchurl {
-    url = ftp://ftp.cs.uu.nl/mirror/postfix/postfix-release/official/postfix-2.8.6.tar.gz;
+    url = "ftp://ftp.cs.uu.nl/mirror/postfix/postfix-release/official/${name}.tar.gz";
     sha256 = "1rfsfhna5hy5lc6hkg1zc2862pdc5c1y9z6aiy8rinlmzrfplhlb";
   };