diff --git a/fastapi_users/db/__init__.py b/fastapi_users/db/__init__.py
index d226c238..79e7df9b 100644
--- a/fastapi_users/db/__init__.py
+++ b/fastapi_users/db/__init__.py
@@ -1,6 +1,14 @@
 from fastapi_users.db.base import BaseUserDatabase  # noqa: F401
-from fastapi_users.db.mongodb import MongoDBUserDatabase  # noqa: F401
-from fastapi_users.db.sqlalchemy import (  # noqa: F401
-    SQLAlchemyBaseUserTable,
-    SQLAlchemyUserDatabase,
-)
+
+try:
+    from fastapi_users.db.mongodb import MongoDBUserDatabase  # noqa: F401
+except ImportError:  # pragma: no cover
+    pass
+
+try:
+    from fastapi_users.db.sqlalchemy import (  # noqa: F401
+        SQLAlchemyBaseUserTable,
+        SQLAlchemyUserDatabase,
+    )
+except ImportError:  # pragma: no cover
+    pass