diff --git a/templates/repo/issue/view_content/sidebar.tmpl b/templates/repo/issue/view_content/sidebar.tmpl
index bb0bb2cff..9290ba33c 100644
--- a/templates/repo/issue/view_content/sidebar.tmpl
+++ b/templates/repo/issue/view_content/sidebar.tmpl
@@ -387,7 +387,7 @@
 						{{if ne .Issue.DeadlineUnix 0}}
 							{{svg "octicon-pencil"}}
 						{{else}}
-							{{svg "octicon-plus"}}
+							{{svg "octicon-check"}}
 						{{end}}
 					</button>
 				</form>