diff --git a/presigned_url.go b/presigned_url.go
index 7cb699c..ea7513d 100644
--- a/presigned_url.go
+++ b/presigned_url.go
@@ -20,7 +20,7 @@ func (c Client) GetPresignedURL(ctx context.Context, bucket, object, fileType st
 
 	// add content type for video
 	if fileType == ListTypes.Video {
-		parts := strings.Split(object, ".")[1]
+		parts := strings.Split(object, ".")
 		reqParams.Set("response-content-type", fmt.Sprintf("video/%s", parts[len(parts)-1]))
 	}