diff --git a/gtests/net/packetdrill/parser.y b/gtests/net/packetdrill/parser.y
index 631aabcb10ddd3ef2115ca832d7ddef65a0116f3..7799260aaf7490f53a17d1b1746e016c33446474 100644
--- a/gtests/net/packetdrill/parser.y
+++ b/gtests/net/packetdrill/parser.y
@@ -1451,7 +1451,7 @@ dup
 
 sctp_generic_spec
 : '[' byte_list ']' {
-	if (($2 == NULL)) {
+	if ($2 == NULL) {
 		semantic_error("byte field can not be empty");
 	}