diff --git a/types/vote.go b/types/vote.go
index 3d840f294..8d8331613 100644
--- a/types/vote.go
+++ b/types/vote.go
@@ -118,7 +118,8 @@ func (vote *Vote) Copy() *Vote {
 // 6. type string
 // 7. first 6 bytes of block hash
 // 8. first 6 bytes of signature
-// 9. timestamp
+// 9. first 6 bytes of vote extension
+// 10. timestamp
 func (vote *Vote) String() string {
 	if vote == nil {
 		return nilVoteStr
@@ -134,7 +135,7 @@ func (vote *Vote) String() string {
 		panic("Unknown vote type")
 	}
 
-	return fmt.Sprintf("Vote{%v:%X %v/%02d/%v(%v) %X %X @ %s}",
+	return fmt.Sprintf("Vote{%v:%X %v/%02d/%v(%v) %X %X %X @ %s}",
 		vote.ValidatorIndex,
 		tmbytes.Fingerprint(vote.ValidatorAddress),
 		vote.Height,
@@ -143,6 +144,7 @@ func (vote *Vote) String() string {
 		typeString,
 		tmbytes.Fingerprint(vote.BlockID.Hash),
 		tmbytes.Fingerprint(vote.Signature),
+		tmbytes.Fingerprint(vote.Extension),
 		CanonicalTime(vote.Timestamp),
 	)
 }
diff --git a/types/vote_test.go b/types/vote_test.go
index 9263cb2a8..9f77617e5 100644
--- a/types/vote_test.go
+++ b/types/vote_test.go
@@ -143,7 +143,7 @@ func TestVoteSignBytesTestVectors(t *testing.T) {
 				ExtensionSignature: []byte{},
 			},
 			[]byte{
-				0x38,                                   // length
+				0x2e,                                   // length
 				0x11,                                   // (field_number << 3) | wire_type
 				0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, // height
 				0x19,                                   // (field_number << 3) | wire_type
@@ -155,12 +155,6 @@ func TestVoteSignBytesTestVectors(t *testing.T) {
 				0x32,
 				0xd, 0x74, 0x65, 0x73, 0x74, 0x5f, 0x63, 0x68, 0x61, 0x69, 0x6e, 0x5f, 0x69, 0x64, // chainID
 				// (field_number << 3) | wire_type
-				0x3a,
-				0x8,                                // length
-				0xa,                                // (field_number << 3) | wire_type
-				0x6,                                // length
-				0x73, 0x69, 0x67, 0x6e, 0x65, 0x64, // AppDataSigned
-				// SelfAuthenticating data is excluded on signing
 			}, // chainID
 		},
 	}