--- a/mozglue/build/WindowsDllBlocklist.cpp
+++ b/mozglue/build/WindowsDllBlocklist.cpp
@@ -217,16 +217,19 @@ static DllBlockInfo sWindowsDllBlocklist
   { "prls.dll", ALL_VERSIONS },
   { "prls64.dll", ALL_VERSIONS },
   { "rlls.dll", ALL_VERSIONS },
   { "rlls64.dll", ALL_VERSIONS },
 
   // Vorbis DirectShow filters, bug 1239690.
   { "vorbis.acm", MAKE_VERSION(0, 0, 3, 6) },
 
+  // AhnLab Internet Security, bug 1311969
+  { "nzbrcom.dll", ALL_VERSIONS },
+
   { nullptr, 0 }
 };
 
 #ifndef STATUS_DLL_NOT_FOUND
 #define STATUS_DLL_NOT_FOUND ((DWORD)0xC0000135L)
 #endif
 
 // define this for very verbose dll load debug spew