diff --git a/slstatus.c b/slstatus.c
index c852b2f..6a338f9 100644
--- a/slstatus.c
+++ b/slstatus.c
@@ -717,7 +717,7 @@ wifi_essid(const char *iface)
 
 	memset(&wreq, 0, sizeof(struct iwreq));
 	wreq.u.essid.length = IW_ESSID_MAX_SIZE+1;
-	snprintf(wreq.ifr_name, ifrn_name, "%s", iface);
+	snprintf(wreq.ifr_name, sizeof(wreq.ifr_name), "%s", iface);
 
 	if (sockfd == -1) {
 		warn("Failed to get ESSID for interface %s", iface);