diff --git a/CHANGELOG b/CHANGELOG
index f5b983e63..05d5d446e 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,5 +1,9 @@
 # Nmap Changelog ($Id$); -*-text-*-
 
+o Fix reverse DNS on Windows which was failing with the message "mass_dns:
+  warning: Unable to determine any DNS servers." This was because the interface
+  GUID comparison needed to be done case-insensitive. [Robert Croteau]
+
 o [Ncat] Restore the connection success message that Ncat prints with -v. This
   was accidentally suppressed when not using -z.
 
diff --git a/nmap_dns.cc b/nmap_dns.cc
index 634abfd6f..6d16137c4 100644
--- a/nmap_dns.cc
+++ b/nmap_dns.cc
@@ -926,7 +926,7 @@ static bool interface_is_known_by_guid(const char *guid) {
     pcap_guid = strchr(pcap_name, '{');
     if (pcap_guid == NULL)
       continue;
-    if (strcmp(guid, pcap_guid) == 0)
+    if (strcasecmp(guid, pcap_guid) == 0)
       return true;
   }