diff --git a/telegram/utils.go b/telegram/utils.go
index 03e1dcf..2fd1bca 100644
--- a/telegram/utils.go
+++ b/telegram/utils.go
@@ -1734,8 +1734,10 @@ func (c *Client) messageToPrefix(message *client.Message, previewString string,
 			reply = gwReply
 
 			var replyStart, replyEnd int
+			var hadPrefix bool
 
 			if len(prefix) > 0 {
+				hadPrefix = true
 				replyStart = c.countCharsInLines(&prefix) + (len(prefix)-1)*len(messageHeaderSeparator)
 			}
 
@@ -1743,7 +1745,7 @@ func (c *Client) messageToPrefix(message *client.Message, previewString string,
 			prefix = append(prefix, replyLine)
 
 			replyEnd = replyStart + utf8.RuneCountInString(replyLine)
-			if len(prefix) > 0 {
+			if hadPrefix {
 				replyEnd += len(messageHeaderSeparator)
 			}