diff --git a/nixos/modules/services/databases/postgresql.nix b/nixos/modules/services/databases/postgresql.nix
index 7b30360590ec..7a4fa708eadf 100644
--- a/nixos/modules/services/databases/postgresql.nix
+++ b/nixos/modules/services/databases/postgresql.nix
@@ -106,7 +106,7 @@ in
       identMap = mkOption {
         type = types.lines;
         default = "";
-        example = literalExample ''
+        example = ''
           map-name-0 system-username-0 database-username-0
           map-name-1 system-username-1 database-username-1
         '';