diff --git a/mailnews/news/src/nsNNTPArticleList.cpp b/mailnews/news/src/nsNNTPArticleList.cpp
index 252f993b738c..acaaf4ab37f7 100644
--- a/mailnews/news/src/nsNNTPArticleList.cpp
+++ b/mailnews/news/src/nsNNTPArticleList.cpp
@@ -26,7 +26,7 @@
 
 typedef PRUint32 nsMsgKey;
 
-class nsNNTPArticleList : nsINNTPArticleList
+class nsNNTPArticleList : public nsINNTPArticleList
 #ifdef HAVE_CHANGELISTENER
  : public ChangeListener
 #endif
diff --git a/mailnews/news/src/nsNNTPNewsgroupPost.cpp b/mailnews/news/src/nsNNTPNewsgroupPost.cpp
index 3fcc09d57891..3d68140933a4 100644
--- a/mailnews/news/src/nsNNTPNewsgroupPost.cpp
+++ b/mailnews/news/src/nsNNTPNewsgroupPost.cpp
@@ -57,7 +57,7 @@
 #define HEADER_LAST             HEADER_MESSAGEID
 
 
-class nsNNTPNewsgroupPost : nsINNTPNewsgroupPost {
+class nsNNTPNewsgroupPost : public nsINNTPNewsgroupPost {
     
 public:
     nsNNTPNewsgroupPost();