diff --git a/dkim.nix b/dkim.nix
index ec4b135..29ea387 100644
--- a/dkim.nix
+++ b/dkim.nix
@@ -30,7 +30,7 @@ let
     '') domains));
 
   makeSigningTable = domains:
-    pkgs.writeTextDir "signing.table" (concatStrings "\n" (map (dom: ''
+    pkgs.writeTextDir "signing.table" (concatStrings (map (dom: ''
       ${dom} ${dom}
     '') domains));