diff --git a/dbt/adapters/mariadb/connections.py b/dbt/adapters/mariadb/connections.py
index 30a3579..0f69955 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 6fb69fd..4f7b3f8 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 c6039e3..2876ab7 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