diff --git a/mozilla/uriloader/exthandler/nsExternalHelperAppService.cpp b/mozilla/uriloader/exthandler/nsExternalHelperAppService.cpp
index 1c9d85da581..90e0e8ee699 100644
--- a/mozilla/uriloader/exthandler/nsExternalHelperAppService.cpp
+++ b/mozilla/uriloader/exthandler/nsExternalHelperAppService.cpp
@@ -1555,6 +1555,7 @@ nsresult nsExternalHelperAppService::GetMIMEInfoForMimeTypeFromExtras(const char
           mimeInfo->SetMacCreator(extraMimeEntries[index].mMacCreator);
 
           *aMIMEInfo = mimeInfo;
+          NS_ADDREF(*aMIMEInfo);
       }
   }