diff --git a/nixos/modules/services/web-apps/keycloak.nix b/nixos/modules/services/web-apps/keycloak.nix
index 2dce4b242a30..d4177c77bce3 100644
--- a/nixos/modules/services/web-apps/keycloak.nix
+++ b/nixos/modules/services/web-apps/keycloak.nix
@@ -230,7 +230,7 @@ in
     };
 
     extraConfig = lib.mkOption {
-      type = lib.types.attrs;
+      type = lib.types.attrsOf lib.types.anything;
       default = { };
       example = lib.literalExpression ''
         {