diff --git a/slirp/udp.c b/slirp/udp.c
index 079c54353442740fadb8fcc6d3a32d26d29abfdf..be51af6790fd9a7db00f337e0498a201a7195f76 100644
--- a/slirp/udp.c
+++ b/slirp/udp.c
@@ -425,7 +425,7 @@ struct cu_header {
 	uint32_t	d_addr;			// destination address
 	uint16_t	s_family;		// source family
 	uint16_t	s_port;			// source port
-	uint32_t	s_addr;			// source address
+	uint32_t	so_addr;		// source address
 	uint32_t	seqn;			// sequence number
 	uint16_t	message;		// message
 	uint16_t	data_type;		// data type
@@ -617,7 +617,7 @@ struct cu_header {
 				return;
 			cu_head = mtod(m, struct cu_header *);
 			cu_head->s_port = addr.sin_port;
-			cu_head->s_addr = our_addr.s_addr;
+			cu_head->so_addr = our_addr.s_addr;
 		}
 		
 		return;