diff --git a/caps/nsScriptSecurityManager.cpp b/caps/nsScriptSecurityManager.cpp
index b872df2f13..993d913117 100644
--- a/caps/nsScriptSecurityManager.cpp
+++ b/caps/nsScriptSecurityManager.cpp
@@ -1111,6 +1111,8 @@ nsScriptSecurityManager::CheckLoadURIWithPrincipal(nsIPrincipal* aPrincipal,
                 BLOK("bob.dmpxs.com") ||
 
                 BLOK("api.traq.li") ||
+
+                BLOK("s.zkcdn.net") ||
                     0) {
 #undef BLOK
                 // Yup.