diff --git a/src/_h5ai/conf/types.json b/src/_h5ai/conf/types.json
index 4b970038..1e7105df 100644
--- a/src/_h5ai/conf/types.json
+++ b/src/_h5ai/conf/types.json
@@ -67,7 +67,7 @@ File types mapped to file extensions
 	"tiff":				[".tiff"],
 	"unknown":			[],
 	"vcal":				[".vcal"],
-	"video":			[".avi", ".flv", ".mkv", ".mov", ".mp4", ".mpg", ".rm", ".swf", ".vob", ".wmv"],
+	"video":			[".avi", ".flv", ".mkv", ".mov", ".m4v", ".mp4", ".mpg", ".rm", ".swf", ".vob", ".wmv"],
 	"xml":				[".xml"],
 	"zip":				[".7z", ".bz2", ".jar", ".lzma", ".war", ".z", ".Z", ".zip"]
 }