diff --git a/u_parrots.go b/u_parrots.go
index c19c4b9..c0e4975 100644
--- a/u_parrots.go
+++ b/u_parrots.go
@@ -602,7 +602,7 @@ func (uconn *UConn) ApplyPreset(p *ClientHelloSpec) error {
 	for i := range uconn.greaseSeed {
 		uconn.greaseSeed[i] = binary.LittleEndian.Uint16(grease_bytes[2*i : 2*i+2])
 	}
-	if uconn.greaseSeed[ssl_grease_extension1] == uconn.greaseSeed[ssl_grease_extension2] {
+	if GetBoringGREASEValue(uconn.greaseSeed, ssl_grease_extension1) == GetBoringGREASEValue(uconn.greaseSeed, ssl_grease_extension2) {
 		uconn.greaseSeed[ssl_grease_extension2] ^= 0x1010
 	}