diff --git a/nixos/modules/services/misc/forgejo.nix b/nixos/modules/services/misc/forgejo.nix
index f26658b7bcb44..b2920981efbda 100644
--- a/nixos/modules/services/misc/forgejo.nix
+++ b/nixos/modules/services/misc/forgejo.nix
@@ -428,6 +428,17 @@ in
       ];
     };
 
+    # Work around 'pq: permission denied for schema public' with postgres v15, until a
+    # solution for `services.postgresql.ensureUsers` is found.
+    # See https://github.com/NixOS/nixpkgs/issues/216989
+    systemd.services.postgresql.postStart = lib.mkIf (
+      usePostgresql
+      && cfg.database.createDatabase
+      && lib.strings.versionAtLeast config.services.postgresql.package.version "15.0"
+    ) (lib.mkAfter ''
+      $PSQL -tAc 'ALTER DATABASE "${cfg.database.name}" OWNER TO "${cfg.database.user}";'
+    '');
+
     services.mysql = optionalAttrs (useMysql && cfg.database.createDatabase) {
       enable = mkDefault true;
       package = mkDefault pkgs.mariadb;