diff --git a/modules/base/markdown.go b/modules/base/markdown.go
index 199e88f97..045477864 100644
--- a/modules/base/markdown.go
+++ b/modules/base/markdown.go
@@ -133,7 +133,7 @@ var (
 	MentionPattern     = regexp.MustCompile(`(\s|^)@[0-9a-zA-Z_\.]+`)
 	commitPattern      = regexp.MustCompile(`(\s|^)https?.*commit/[0-9a-zA-Z]+(#+[0-9a-zA-Z-]*)?`)
 	issueFullPattern   = regexp.MustCompile(`(\s|^)https?.*issues/[0-9]+(#+[0-9a-zA-Z-]*)?`)
-	issueIndexPattern  = regexp.MustCompile(`(^|\W)#[0-9]+\b`)
+	issueIndexPattern  = regexp.MustCompile(`( |^|\()#[0-9]+\b`)
 	sha1CurrentPattern = regexp.MustCompile(`\b[0-9a-f]{40}\b`)
 )