diff --git a/mbuni/doc/userguide.shtml b/mbuni/doc/userguide.shtml
index 072c7da..8ba6b54 100644
--- a/mbuni/doc/userguide.shtml
+++ b/mbuni/doc/userguide.shtml
@@ -3341,7 +3341,7 @@ This interface should be invoked from your MTA as follows:
mmsfromemail -f from_address -t recipient_address
--p sender_mmsc_hostname conf_file
+-s sender_mmsc_hostname conf_file
diff --git a/mbuni/mmsc/mmsfromemail.c b/mbuni/mmsc/mmsfromemail.c
index e36919f..f3392d1 100644
--- a/mbuni/mmsc/mmsfromemail.c
+++ b/mbuni/mmsc/mmsfromemail.c
@@ -462,7 +462,7 @@ static int find_own(int i, int argc, char *argv[])
return 1;
} else
return -1;
- else if (argv[i][1] == 'p') /* Proxy name if any. */
+ else if (argv[i][1] == 's') /* Proxy name if any. */
if (i + 1 < argc) {
xproxy = octstr_create(argv[i+1]);
return 1;