diff --git a/channels/chan_iax2.c b/channels/chan_iax2.c
index 266c2973be979657770ff58d7f1f2b07397d841a..f60e8b521cbd4e14aef6337cfbd75a6b1b161f98 100755
--- a/channels/chan_iax2.c
+++ b/channels/chan_iax2.c
@@ -2945,7 +2945,7 @@ static int iax2_call(struct ast_channel *c, char *dest, int timeout)
 	if (secret) {
 		if (secret[0] == '[') {
 			/* This is an RSA key, not a normal secret */
-			ast_copy_string(iaxs[callno]->outkey, secret + 1, sizeof(iaxs[callno]->secret));
+			ast_copy_string(iaxs[callno]->outkey, secret + 1, sizeof(iaxs[callno]->outkey));
 			if (!ast_strlen_zero(iaxs[callno]->outkey)) {
 				iaxs[callno]->outkey[strlen(iaxs[callno]->outkey) - 1] = '\0';
 			}