diff --git a/mailnews/base/src/nsMsgMailSession.cpp b/mailnews/base/src/nsMsgMailSession.cpp
index cec426f54c4..ebef1a09d14 100644
--- a/mailnews/base/src/nsMsgMailSession.cpp
+++ b/mailnews/base/src/nsMsgMailSession.cpp
@@ -90,5 +90,6 @@ nsresult nsMsgMailSession::GetAccountManager(nsIMsgAccountManager* *aAM)
   if (!aAM) return NS_ERROR_NULL_POINTER;
   
   *aAM = m_accountManager;
+  NS_IF_ADDREF(*aAM);
   return NS_OK;
 }