diff --git a/mailnews/addrbook/src/nsAddressBook.h b/mailnews/addrbook/src/nsAddressBook.h
index 5393b7f63c3..8a3aa6756f8 100644
--- a/mailnews/addrbook/src/nsAddressBook.h
+++ b/mailnews/addrbook/src/nsAddressBook.h
@@ -38,7 +38,7 @@
 #define NC_RDF_DELETE				"http://home.netscape.com/NC-rdf#Delete"
 #define NC_RDF_NEWDIRECTORY			"http://home.netscape.com/NC-rdf#NewDirectory"
 
-class nsAddressBook : public nsIAddressBook, nsICmdLineHandler
+class nsAddressBook : public nsIAddressBook, public nsICmdLineHandler
 {
   
 public: