diff --git a/routers/repo/cloudbrain.go b/routers/repo/cloudbrain.go
index dc1ead481..7a78f914a 100755
--- a/routers/repo/cloudbrain.go
+++ b/routers/repo/cloudbrain.go
@@ -90,7 +90,7 @@ func cutString(str string, lens int) string {
 
 func jobNamePrefixValid(s string) string {
 	lowStr := strings.ToLower(s)
-	re := regexp.MustCompile(`[^a-z0-9\\.\\-]+`)
+	re := regexp.MustCompile(`[^a-z0-9_\\-]+`)
 	return re.ReplaceAllString(lowStr, "")
 }