diff --git a/src/modules/services/redis.nix b/src/modules/services/redis.nix
index dc7d62e4f..cc6fd7067 100644
--- a/src/modules/services/redis.nix
+++ b/src/modules/services/redis.nix
@@ -57,7 +57,7 @@ in
 
     extraConfig = mkOption {
       type = types.lines;
-      default = "";
+      default = "locale-collate C";
       description = "Additional text to be appended to `redis.conf`.";
     };
   };