diff --git a/internal/service/rds/instance.go b/internal/service/rds/instance.go
index 859b397c4bd..da375537a91 100644
--- a/internal/service/rds/instance.go
+++ b/internal/service/rds/instance.go
@@ -1690,10 +1690,6 @@ func resourceInstanceRead(ctx context.Context, d *schema.ResourceData, meta inte
 	d.Set("replicas", aws.StringValueSlice(v.ReadReplicaDBInstanceIdentifiers))
 	d.Set("replicate_source_db", v.ReadReplicaSourceDBInstanceIdentifier)
 	d.Set("resource_id", v.DbiResourceId)
-	var securityGroupNames []string
-	for _, v := range v.DBSecurityGroups {
-		securityGroupNames = append(securityGroupNames, aws.StringValue(v.DBSecurityGroupName))
-	}
 	d.Set("status", v.DBInstanceStatus)
 	d.Set("storage_encrypted", v.StorageEncrypted)
 	d.Set("storage_throughput", v.StorageThroughput)
diff --git a/internal/service/rds/instance_data_source.go b/internal/service/rds/instance_data_source.go
index e601bb5de59..66c07689db1 100644
--- a/internal/service/rds/instance_data_source.go
+++ b/internal/service/rds/instance_data_source.go
@@ -232,10 +232,6 @@ func dataSourceInstanceRead(ctx context.Context, d *schema.ResourceData, meta in
 		parameterGroupNames = append(parameterGroupNames, aws.StringValue(v.DBParameterGroupName))
 	}
 	d.Set("db_parameter_groups", parameterGroupNames)
-	var securityGroupNames []string
-	for _, v := range v.DBSecurityGroups {
-		securityGroupNames = append(securityGroupNames, aws.StringValue(v.DBSecurityGroupName))
-	}
 	if v.DBSubnetGroup != nil {
 		d.Set("db_subnet_group", v.DBSubnetGroup.DBSubnetGroupName)
 	} else {