diff --git a/src/proto_tcp.c b/src/proto_tcp.c
index cef2ff8..1317d31 100644
--- a/src/proto_tcp.c
+++ b/src/proto_tcp.c
@@ -443,7 +443,7 @@
 		else {
 #ifdef IP_BIND_ADDRESS_NO_PORT
 			static THREAD_LOCAL int bind_address_no_port = 1;
-			setsockopt(fd, SOL_IP, IP_BIND_ADDRESS_NO_PORT, (const void *) &bind_address_no_port, sizeof(int));
+			setsockopt(fd, IPPROTO_IP, IP_BIND_ADDRESS_NO_PORT, (const void *) &bind_address_no_port, sizeof(int));
 #endif
 			ret = tcp_bind_socket(fd, flags, &src->source_addr, conn->src);
 			if (ret != 0)