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-rw-r--r--nixos/modules/services/mail/postfix.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/nixos/modules/services/mail/postfix.nix b/nixos/modules/services/mail/postfix.nix
index 852340c05aa7..23c47aaca7e2 100644
--- a/nixos/modules/services/mail/postfix.nix
+++ b/nixos/modules/services/mail/postfix.nix
@@ -234,7 +234,7 @@ let
 
   headerChecks = concatStringsSep "\n" (map (x: "${x.pattern} ${x.action}") cfg.headerChecks) + cfg.extraHeaderChecks;
 
-  aliases = let separator = if cfg.aliasMapType == "hash" then ":" else ""; in
+  aliases = let separator = optionalString (cfg.aliasMapType == "hash") ":"; in
     optionalString (cfg.postmasterAlias != "") ''
       postmaster${separator} ${cfg.postmasterAlias}
     ''