diff --git a/mozilla/netwerk/mime/src/nsMIMEInfoImpl.cpp b/mozilla/netwerk/mime/src/nsMIMEInfoImpl.cpp
index 99553e0e386..59af0b2ce69 100644
--- a/mozilla/netwerk/mime/src/nsMIMEInfoImpl.cpp
+++ b/mozilla/netwerk/mime/src/nsMIMEInfoImpl.cpp
@@ -203,6 +203,7 @@ NS_IMETHODIMP nsMIMEInfoImpl::SetApplicationDescription(const PRUnichar * aAppli
 NS_IMETHODIMP nsMIMEInfoImpl::GetPreferredApplicationHandler(nsIFile ** aPreferredAppHandler)
 {
   *aPreferredAppHandler = mPreferredApplication;
+  NS_IF_ADDREF(*aPreferredAppHandler);
   return NS_OK;
 }
  
diff --git a/mozilla/uriloader/exthandler/nsMIMEInfoImpl.cpp b/mozilla/uriloader/exthandler/nsMIMEInfoImpl.cpp
index 99553e0e386..59af0b2ce69 100644
--- a/mozilla/uriloader/exthandler/nsMIMEInfoImpl.cpp
+++ b/mozilla/uriloader/exthandler/nsMIMEInfoImpl.cpp
@@ -203,6 +203,7 @@ NS_IMETHODIMP nsMIMEInfoImpl::SetApplicationDescription(const PRUnichar * aAppli
 NS_IMETHODIMP nsMIMEInfoImpl::GetPreferredApplicationHandler(nsIFile ** aPreferredAppHandler)
 {
   *aPreferredAppHandler = mPreferredApplication;
+  NS_IF_ADDREF(*aPreferredAppHandler);
   return NS_OK;
 }