diff --git a/src/osgPlugins/ffmpeg/ReaderWriterFFmpeg.cpp b/src/osgPlugins/ffmpeg/ReaderWriterFFmpeg.cpp
index 173d30915..31a721638 100644
--- a/src/osgPlugins/ffmpeg/ReaderWriterFFmpeg.cpp
+++ b/src/osgPlugins/ffmpeg/ReaderWriterFFmpeg.cpp
@@ -50,6 +50,7 @@ public:
         supportsExtension("mkv",    "Matroska");
         supportsExtension("mjpeg",  "Motion JPEG");
         supportsExtension("mp4",    "MPEG-4");
+        supportsExtension("m4v",    "MPEG-4");
         supportsExtension("sav",    "Unknown");
         supportsExtension("3gp",    "3G multi-media format");
         supportsExtension("sdp",    "Session Description Protocol");
diff --git a/src/osgPlugins/xine/ReaderWriterXine.cpp b/src/osgPlugins/xine/ReaderWriterXine.cpp
index 1b1e0cd1d..b3b83e268 100644
--- a/src/osgPlugins/xine/ReaderWriterXine.cpp
+++ b/src/osgPlugins/xine/ReaderWriterXine.cpp
@@ -316,6 +316,7 @@ class ReaderWriterXine : public osgDB::ReaderWriter
             supportsExtension("ogv","");
             supportsExtension("flv","");
             supportsExtension("mov","");
+            supportsExtension("m4v","");
             supportsExtension("mpg","Mpeg movie format");
             supportsExtension("mpv","Mpeg movie format");
             supportsExtension("wmv","");