diff --git a/src/osgDB/Registry.cpp b/src/osgDB/Registry.cpp
index 18cd60c59..fb2bd5550 100644
--- a/src/osgDB/Registry.cpp
+++ b/src/osgDB/Registry.cpp
@@ -166,6 +166,7 @@ Registry::Registry()
     addFileExtensionAlias("mpv",  "qt");
     addFileExtensionAlias("dv",   "qt");
     addFileExtensionAlias("mp4",   "qt");
+    addFileExtensionAlias("m4v",   "qt");
 #else
     addFileExtensionAlias("jpg",  "jpeg");
     addFileExtensionAlias("jpe",  "jpeg");
diff --git a/src/osgPlugins/quicktime/ReaderWriterQT.cpp b/src/osgPlugins/quicktime/ReaderWriterQT.cpp
index 4e2ffa40d..76fce7cb7 100644
--- a/src/osgPlugins/quicktime/ReaderWriterQT.cpp
+++ b/src/osgPlugins/quicktime/ReaderWriterQT.cpp
@@ -37,6 +37,7 @@ class ReaderWriterQT : public osgDB::ReaderWriter
                    osgDB::equalCaseInsensitive(extension,"mpg") ||
                    osgDB::equalCaseInsensitive(extension,"mpv") ||
                    osgDB::equalCaseInsensitive(extension,"mp4") ||
+                   osgDB::equalCaseInsensitive(extension,"m4v") ||
                    osgDB::equalCaseInsensitive(extension,"dv");
         }