diff --git a/modules/structs/repo.go b/modules/structs/repo.go
index 765546a5aa..8146166465 100644
--- a/modules/structs/repo.go
+++ b/modules/structs/repo.go
@@ -143,7 +143,7 @@ type CreateRepoOption struct {
 	// Gitignores to use
 	Gitignores string `json:"gitignores"`
 	// License to use
-	License string `json:"license"`
+	License string `json:"license" binding:"MaxSize(100)"`
 	// Readme of the repository to create
 	Readme string `json:"readme"`
 	// DefaultBranch of the repository (used when initializes and in template)
diff --git a/services/forms/repo_form.go b/services/forms/repo_form.go
index 765a723968..956329f480 100644
--- a/services/forms/repo_form.go
+++ b/services/forms/repo_form.go
@@ -28,7 +28,7 @@ type CreateRepoForm struct {
 	AutoInit      bool
 	Gitignores    string
 	IssueLabels   string
-	License       string
+	License       string `binding:"MaxSize(100)"`
 	Readme        string
 	Template      bool