diff --git a/internal/rootcoord/create_db_task.go b/internal/rootcoord/create_db_task.go
index 35f1b67ddc..5db6dbeef3 100644
--- a/internal/rootcoord/create_db_task.go
+++ b/internal/rootcoord/create_db_task.go
@@ -38,7 +38,7 @@ func (t *createDatabaseTask) Prepare(ctx context.Context) error {
 	}
 
 	cfgMaxDatabaseNum := Params.RootCoordCfg.MaxDatabaseNum.GetAsInt()
-	if len(dbs) > cfgMaxDatabaseNum {
+	if len(dbs) >= cfgMaxDatabaseNum {
 		return merr.WrapErrDatabaseNumLimitExceeded(cfgMaxDatabaseNum)
 	}
 
diff --git a/internal/rootcoord/create_db_task_test.go b/internal/rootcoord/create_db_task_test.go
index 277e7fe495..5f83139150 100644
--- a/internal/rootcoord/create_db_task_test.go
+++ b/internal/rootcoord/create_db_task_test.go
@@ -28,6 +28,7 @@ import (
 	"github.com/milvus-io/milvus-proto/go-api/v2/milvuspb"
 	"github.com/milvus-io/milvus/internal/metastore/model"
 	mockrootcoord "github.com/milvus-io/milvus/internal/rootcoord/mocks"
+	"github.com/milvus-io/milvus/pkg/util/merr"
 	"github.com/milvus-io/milvus/pkg/util/paramtable"
 )
 
@@ -51,9 +52,8 @@ func Test_CreateDBTask_Prepare(t *testing.T) {
 	t.Run("check database number fail", func(t *testing.T) {
 		meta := mockrootcoord.NewIMetaTable(t)
 		cfgMaxDatabaseNum := Params.RootCoordCfg.MaxDatabaseNum.GetAsInt()
-		len := cfgMaxDatabaseNum + 1
-		dbs := make([]*model.Database, 0, len)
-		for i := 0; i < len; i++ {
+		dbs := make([]*model.Database, 0, cfgMaxDatabaseNum)
+		for i := 0; i < cfgMaxDatabaseNum; i++ {
 			dbs = append(dbs, model.NewDefaultDatabase(nil))
 		}
 		meta.On("ListDatabases",
@@ -73,7 +73,7 @@ func Test_CreateDBTask_Prepare(t *testing.T) {
 			},
 		}
 		err := task.Prepare(context.Background())
-		assert.Error(t, err)
+		assert.ErrorIs(t, err, merr.ErrDatabaseNumLimitExceeded)
 	})
 
 	t.Run("ok", func(t *testing.T) {