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-rw-r--r--src/protocol.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/protocol.c b/src/protocol.c
index dd61fd5..85a2142 100644
--- a/src/protocol.c
+++ b/src/protocol.c
@@ -519,7 +519,8 @@ prne_htbt_ser_rc_t prne_htbt_ser_msg_head (
}
if (in->id & 0x8000 ||
PRNE_HTBT_OP_NONE == in->op ||
- (in->id == 0) ^ (in->op == PRNE_HTBT_OP_NOOP)) {
+ (in->op == PRNE_HTBT_OP_NOOP && in->id != 0) ||
+ (in->id == 0 && in->op != PRNE_HTBT_OP_NOOP)) {
return PRNE_HTBT_SER_RC_FMT_ERR;
}