diff --git a/dbt/adapters/mariadb/connections.py b/dbt/adapters/mariadb/connections.py
index c67a56a..af2de84 100644
--- a/dbt/adapters/mariadb/connections.py
+++ b/dbt/adapters/mariadb/connections.py
@@ -18,7 +18,7 @@
 class MariaDBCredentials(Credentials):
     server: str = ""
     port: Optional[int] = None
-    database: Optional[str] = None
+    database: Optional[str] = None  # type: ignore[assignment]
     schema: str = ""
     username: Optional[str] = None
     password: Optional[str] = None
diff --git a/dbt/adapters/mysql/connections.py b/dbt/adapters/mysql/connections.py
index 8c00e6b..7ddec32 100644
--- a/dbt/adapters/mysql/connections.py
+++ b/dbt/adapters/mysql/connections.py
@@ -18,7 +18,7 @@
 class MySQLCredentials(Credentials):
     server: str = ""
     port: Optional[int] = None
-    database: Optional[str] = None
+    database: Optional[str] = None  # type: ignore[assignment]
     schema: str = ""
     username: Optional[str] = None
     password: Optional[str] = None
diff --git a/dbt/adapters/mysql5/connections.py b/dbt/adapters/mysql5/connections.py
index 2eb7e96..b884079 100644
--- a/dbt/adapters/mysql5/connections.py
+++ b/dbt/adapters/mysql5/connections.py
@@ -18,7 +18,7 @@
 class MySQLCredentials(Credentials):
     server: str = ""
     port: Optional[int] = None
-    database: Optional[str] = None
+    database: Optional[str] = None  # type: ignore[assignment]
     schema: str = ""
     username: Optional[str] = None
     password: Optional[str] = None