diff --git a/util/util.go b/util/util.go
index 45be5714..6d282e62 100644
--- a/util/util.go
+++ b/util/util.go
@@ -176,7 +176,7 @@ func Major(version string) string {
 	} else {
 		ver = ss[1]
 	}
-	return ver[0:strings.Index(ver, ".")]
+	return strings.Split(ver, ".")[0]
 }
 
 // GetHTTPClient return http.Client
diff --git a/util/util_test.go b/util/util_test.go
index a3564db4..89049133 100644
--- a/util/util_test.go
+++ b/util/util_test.go
@@ -164,6 +164,10 @@ func Test_major(t *testing.T) {
 			in:       "",
 			expected: "",
 		},
+		{
+			in:       "4",
+			expected: "4",
+		},
 		{
 			in:       "4.1",
 			expected: "4",