diff --git a/apps/app_voicemail.c b/apps/app_voicemail.c
index 2388ad4e73..05dae3117a 100644
--- a/apps/app_voicemail.c
+++ b/apps/app_voicemail.c
@@ -1804,7 +1804,7 @@ static int messagecount(const char *context, const char *mailbox, const char *fo
 		ast_mutex_lock(&vms_p->lock);
 		pgm = mail_newsearchpgm ();
 		hdr = mail_newsearchheader ("X-Asterisk-VM-Extension", (char *)(!ast_strlen_zero(vmu->imapvmshareid) ? vmu->imapvmshareid : mailbox));
-		hdr->next = mail_newsearchheader("X-Asterisk-VM-Context", S_OR(context, "default"));
+		hdr->next = mail_newsearchheader("X-Asterisk-VM-Context", (char *) S_OR(context, "default"));
 		pgm->header = hdr;
 		if (fold != 1) {
 			pgm->unseen = 1;