diff --git a/src/osgDB/Registry.cpp b/src/osgDB/Registry.cpp
index d83933e65..9f19cc131 100644
--- a/src/osgDB/Registry.cpp
+++ b/src/osgDB/Registry.cpp
@@ -236,6 +236,8 @@ Registry::Registry()
     #if defined(USE_QUICKTIME)
         addFileExtensionAlias("mov", "qt");
         addFileExtensionAlias("live", "qt");
+        addFileExtensionAlias("mpg", "qt");
+        addFileExtensionAlias("avi", "qt");
     #endif
 #endif