diff --git a/superset/databases/commands/validate.py b/superset/databases/commands/validate.py
index 066c8a6c58084..e9fe5eaf0c972 100644
--- a/superset/databases/commands/validate.py
+++ b/superset/databases/commands/validate.py
@@ -44,7 +44,7 @@ def __init__(self, parameters: Dict[str, Any]):
 
     def run(self) -> None:
         engine = self._properties["engine"]
-        driver = self._properties["driver"]
+        driver = self._properties.get("driver")
 
         if engine in BYPASS_VALIDATION_ENGINES:
             # Skip engines that are only validated onCreate
diff --git a/tests/integration_tests/databases/api_tests.py b/tests/integration_tests/databases/api_tests.py
index 8ff12b2406b54..b53418fb16496 100644
--- a/tests/integration_tests/databases/api_tests.py
+++ b/tests/integration_tests/databases/api_tests.py
@@ -1425,7 +1425,7 @@ def test_test_connection_failed(self):
         expected_response = {
             "errors": [
                 {
-                    "message": "Could not load database driver: AzureSynapseSpec",
+                    "message": "Could not load database driver: MssqlEngineSpec",
                     "error_type": "GENERIC_COMMAND_ERROR",
                     "level": "warning",
                     "extra": {
diff --git a/tests/integration_tests/db_engine_specs/postgres_tests.py b/tests/integration_tests/db_engine_specs/postgres_tests.py
index 17df25000b364..79a307a488515 100644
--- a/tests/integration_tests/db_engine_specs/postgres_tests.py
+++ b/tests/integration_tests/db_engine_specs/postgres_tests.py
@@ -137,7 +137,11 @@ def test_engine_alias_name(self):
         """
         DB Eng Specs (postgres): Test "postgres" in engine spec
         """
-        self.assertIn("postgres", [engine.engine for engine in load_engine_specs()])
+        backends = set()
+        for engine in load_engine_specs():
+            backends.add(engine.engine)
+            backends.update(engine.engine_aliases)
+        assert "postgres" in backends
 
     def test_extras_without_ssl(self):
         db = mock.Mock()