diff --git a/sys/src/ape/lib/bsd/bind.c b/sys/src/ape/lib/bsd/bind.c
index aa4762c0b..a80a62b64 100644
--- a/sys/src/ape/lib/bsd/bind.c
+++ b/sys/src/ape/lib/bsd/bind.c
@@ -61,7 +61,9 @@ bind(int fd, void *a, int alen)
 
 	n = write(cfd, msg, strlen(msg));
 	if(n < 0){
-		errno = EOPNOTSUPP;	/* Improve error reporting!!! */
+		_syserrno();
+		if(errno == EPLAN9)
+			errno = EOPNOTSUPP;
 		close(cfd);
 		return -1;
 	}
diff --git a/sys/src/ape/lib/bsd/listen.c b/sys/src/ape/lib/bsd/listen.c
index 0b6c14c8d..9ec547dfd 100644
--- a/sys/src/ape/lib/bsd/listen.c
+++ b/sys/src/ape/lib/bsd/listen.c
@@ -143,7 +143,9 @@ listen(fd, backlog)
 		_sock_inaddr2string(r, msg + 9, sizeof msg - 9);
 		n = write(cfd, msg, strlen(msg));
 		if(n < 0){
-			errno = EOPNOTSUPP;	/* Improve error reporting!!! */
+			_syserrno();
+			if(errno == EPLAN9)
+				errno = EOPNOTSUPP;
 			close(cfd);
 			return -1;
 		}