diff --git a/src/internal/m3u-parser/xteve_m3uParser.go b/src/internal/m3u-parser/xteve_m3uParser.go
index 61de3d9..79641b3 100755
--- a/src/internal/m3u-parser/xteve_m3uParser.go
+++ b/src/internal/m3u-parser/xteve_m3uParser.go
@@ -144,6 +144,10 @@ func MakeInterfaceFromM3U(byteStream []byte) (allChannels []interface{}, err err
   }
 
   //fmt.Println(content)
+  if strings.Contains(content, "#EXT-X-TARGETDURATION") || strings.Contains(content, "#EXT-X-MEDIA-SEQUENCE") {
+    err = errors.New("Invalid M3U file, an extended M3U file is required.")
+    return
+  }
 
   if strings.Contains(content, "#EXTM3U") {