diff --git a/src/gmconfig.erl b/src/gmconfig.erl
index 9bab755..371e0d1 100644
--- a/src/gmconfig.erl
+++ b/src/gmconfig.erl
@@ -111,12 +111,7 @@ mock_system_defaults(Config) ->
 
 -spec set_gmconfig_env(gmconfig()) -> ok.
 set_gmconfig_env(Env) when is_map(Env) ->
-    case maps:keys(default_gmconfig()) -- maps:keys(Env) of
-        [] ->
-            persistent_term:put({?MODULE, gmconfig_env}, Env);
-        Unknown ->
-            error({unknown_config_keys, Unknown})
-    end.
+    persistent_term:put({?MODULE, gmconfig_env}, Env).
 
 -spec gmconfig_env() -> gmconfig().
 gmconfig_env() ->