diff --git a/caputils/capture-pcap-util.c b/caputils/capture-pcap-util.c
index 8755fcefaf..1c2cd2c36e 100644
--- a/caputils/capture-pcap-util.c
+++ b/caputils/capture-pcap-util.c
@@ -427,9 +427,13 @@ get_interface_list_findalldevs_ex(const char *source,
 	GList  *il = NULL;
 	pcap_if_t *alldevs, *dev;
 	if_info_t *if_info;
-	char errbuf[PCAP_ERRBUF_SIZE];
+	/*
+	 * WinPcap can overflow PCAP_ERRBUF_SIZE if the host is unreachable.
+	 * Fudge a larger size.
+	 */
+	char errbuf[PCAP_ERRBUF_SIZE*4];
 
-        if (pcap_findalldevs_ex((char *)source, auth, &alldevs, errbuf) == -1) {
+	if (pcap_findalldevs_ex((char *)source, auth, &alldevs, errbuf) == -1) {
 		*err = CANT_GET_INTERFACE_LIST;
 		if (err_str != NULL)
 			*err_str = cant_get_if_list_error_message(errbuf);