diff --git a/mozilla/caps/include/nsScriptSecurityManager.h b/mozilla/caps/include/nsScriptSecurityManager.h
index cf3189dd5db..dea66db1461 100644
--- a/mozilla/caps/include/nsScriptSecurityManager.h
+++ b/mozilla/caps/include/nsScriptSecurityManager.h
@@ -84,7 +84,7 @@ struct ClassPolicy;
 // PrincipalKey //
 /////////////////////
 
-class NS_COM PrincipalKey : public PLDHashEntryHdr
+class PrincipalKey : public PLDHashEntryHdr
 {
 public:
     typedef const nsIPrincipal* KeyType;