diff --git a/toolkit/xre/nsWindowsDllBlocklist.h b/toolkit/xre/nsWindowsDllBlocklist.h
index add3c01ce23..05a98e52ec2 100644
--- a/toolkit/xre/nsWindowsDllBlocklist.h
+++ b/toolkit/xre/nsWindowsDllBlocklist.h
@@ -97,6 +97,9 @@ static DllBlockInfo sWindowsDllBlocklist[] = {
   // fgjk4wvb.dll - Suspected malware
   {"fgjk4wvb.dll", MAKE_VERSION(8,8,8,8)},
   
+  // radhslib.dll - Naomi internet filter - unmaintained since 2006
+  {"radhslib.dll", UNVERSIONED},
+  
   // leave these two in always for tests
   { "mozdllblockingtest.dll", ALL_VERSIONS },
   { "mozdllblockingtest_versioned.dll", 0x0000000400000000ULL },