diff --git a/models/issue.go b/models/issue.go
index 307ace816d61..f16c2e256d20 100644
--- a/models/issue.go
+++ b/models/issue.go
@@ -612,7 +612,7 @@ type Milestone struct {
 	RepoId          int64 `xorm:"INDEX"`
 	Index           int64
 	Name            string
-	Content         string
+	Content         string `xorm:"TEXT"`
 	RenderedContent string `xorm:"-"`
 	IsClosed        bool
 	NumIssues       int