diff --git a/nix/modules/hive-forge.nix b/nix/modules/hive-forge.nix
index bad108e8..5f84f9f8 100644
--- a/nix/modules/hive-forge.nix
+++ b/nix/modules/hive-forge.nix
@@ -355,9 +355,7 @@ in
         assertion = lib.all (m: lib.length (lib.splitString "/" m.dest) == 2) effectiveMirrors;
         message = ''
           Every services.hyperhive.forge.mirrors[].dest must be exactly
-          "<owner>/<repo>" (one slash). Got: ${
-            lib.concatMapStringsSep ", " (m: m.dest) effectiveMirrors
-          }
+          "<owner>/<repo>" (one slash). Got: ${lib.concatMapStringsSep ", " (m: m.dest) effectiveMirrors}
         '';
       }
       {