diff --git a/rule/struct-tag.go b/rule/struct-tag.go
index 45308d3b3..d1c8056aa 100644
--- a/rule/struct-tag.go
+++ b/rule/struct-tag.go
@@ -137,7 +137,7 @@ func (lintStructTagRule) getTagName(tag *structtag.Tag) string {
 	case keyProtobuf:
 		for _, option := range tag.Options {
 			if strings.HasPrefix(option, "name=") {
-				return strings.TrimLeft(option, "name=")
+				return strings.TrimPrefix(option, "name=")
 			}
 		}
 		return "" //protobuf tag lacks 'name' option
diff --git a/testdata/struct-tag.go b/testdata/struct-tag.go
index 21e73aaf6..93cbc14da 100644
--- a/testdata/struct-tag.go
+++ b/testdata/struct-tag.go
@@ -116,6 +116,8 @@ type Simple struct {
 	ODouble              *float64 `protobuf:"fixed64,014,opt,name=o_double,json=oDouble"`      // MATCH /duplicated tag number 14/
 	ODoubleStr           *float64 `protobuf:"fixed6,17,opt,name=o_double_str,json=oDoubleStr"` // MATCH /invalid protobuf tag name 'fixed6'/
 	OString              *string  `protobuf:"bytes,18,opt,name=o_string,json=oString"`
+	OString2             *string  `protobuf:"bytes,name=ameno"`
+	OString3             *string  `protobuf:"bytes,name=ameno"` // MATCH /duplicate tag name: 'ameno'/
 	XXX_NoUnkeyedLiteral struct{} `json:"-"`
 	XXX_unrecognized     []byte   `json:"-"`
 	XXX_sizecache        int32    `json:"-"`