diff --git a/mysql/lib/dialect/mysql2_driver_dialect.ts b/mysql/lib/dialect/mysql2_driver_dialect.ts
index 61b9003d..fd59616a 100644
--- a/mysql/lib/dialect/mysql2_driver_dialect.ts
+++ b/mysql/lib/dialect/mysql2_driver_dialect.ts
@@ -76,7 +76,7 @@ export class MySQL2DriverDialect implements DriverDialect {
   }
 
   setKeepAliveProperties(props: Map<string, any>, keepAliveProps: any) {
-    if (keepAliveProps && keepAliveProps.get(MySQL2DriverDialect.KEEP_ALIVE_PROPERTY_NAME)) {
+    if (keepAliveProps && keepAliveProps[MySQL2DriverDialect.KEEP_ALIVE_PROPERTY_NAME] !== undefined) {
       throw new UnsupportedMethodError("Keep alive configuration is not supported for MySQL2.");
     }
   }
diff --git a/pg/lib/dialect/node_postgres_driver_dialect.ts b/pg/lib/dialect/node_postgres_driver_dialect.ts
index dc23f28d..47b643df 100644
--- a/pg/lib/dialect/node_postgres_driver_dialect.ts
+++ b/pg/lib/dialect/node_postgres_driver_dialect.ts
@@ -83,13 +83,13 @@ export class NodePostgresDriverDialect implements DriverDialect {
       return;
     }
 
-    const keepAlive = keepAliveProps.get(NodePostgresDriverDialect.KEEP_ALIVE_PROPERTY_NAME);
-    const keepAliveInitialDelayMillis = keepAliveProps.get(NodePostgresDriverDialect.KEEP_ALIVE_INITIAL_DELAY_MILLIS_PROPERTY_NAME);
+    const keepAlive = keepAliveProps[NodePostgresDriverDialect.KEEP_ALIVE_PROPERTY_NAME];
+    const keepAliveInitialDelayMillis = keepAliveProps[NodePostgresDriverDialect.KEEP_ALIVE_INITIAL_DELAY_MILLIS_PROPERTY_NAME];
 
-    if (keepAlive) {
+    if (keepAlive !== undefined) {
       props.set(NodePostgresDriverDialect.KEEP_ALIVE_PROPERTY_NAME, keepAlive);
     }
-    if (keepAliveInitialDelayMillis) {
+    if (keepAliveInitialDelayMillis !== undefined) {
       props.set(NodePostgresDriverDialect.KEEP_ALIVE_INITIAL_DELAY_MILLIS_PROPERTY_NAME, keepAliveInitialDelayMillis);
     }
   }