diff --git a/src/iperf_api.c b/src/iperf_api.c
index 11a9c70..a178adb 100644
--- a/src/iperf_api.c
+++ b/src/iperf_api.c
@@ -59,6 +59,12 @@ usage_long()
 }
 
 
+void warning(char *str)
+{
+	fprintf(stderr, "warning: %s\n", str);
+}
+
+
 /********************** Get/set test protocol structure ***********************/
 
 struct protocol *
@@ -242,8 +248,11 @@ iperf_parse_arguments(struct iperf_test *test, int argc, char **argv)
                 break;
             case 'u':
                 if (test->role == 's') {
+					warning("ignoring client only argument --udp (-u)");
+				/* XXX: made a warning
                     i_errno = IECLIENTONLY;
                     return (-1);
+				*/
                 }
                 set_protocol(test, Pudp);
                 test->settings->blksize = DEFAULT_UDP_BLKSIZE;
diff --git a/src/iperf_api.h b/src/iperf_api.h
index 60ac67e..d2e49d9 100644
--- a/src/iperf_api.h
+++ b/src/iperf_api.h
@@ -99,6 +99,7 @@ int iperf_recv(struct iperf_test *);
 void sig_handler(int);
 void usage();
 void usage_long();
+void warning(char *);
 int all_data_sent(struct iperf_test *);
 int package_parameters(struct iperf_test *);
 int parse_parameters(struct iperf_test *);