diff --git a/mozilla/netwerk/dns/src/nsEffectiveTLDService.cpp b/mozilla/netwerk/dns/src/nsEffectiveTLDService.cpp
index cd14ce06400..140087aaa38 100644
--- a/mozilla/netwerk/dns/src/nsEffectiveTLDService.cpp
+++ b/mozilla/netwerk/dns/src/nsEffectiveTLDService.cpp
@@ -148,8 +148,8 @@ nsEffectiveTLDService::GetEffectiveTLDLength(const nsACString &aHostname,
         *effTLDLength = end - prevDomain;
         break;
 
-      } else if (entry->IsNormal()) {
-        // specific match
+      } else if (entry->IsNormal() || !nextDot) {
+        // specific match, or we've hit the top domain level
         *effTLDLength = end - currDomain;
         break;