diff --git a/types.go b/types.go
index 7ccd6ff..95231e4 100644
--- a/types.go
+++ b/types.go
@@ -385,7 +385,7 @@ type InlineKeyboardButton struct {
 	SwitchInlineQuery            *string       `json:"switch_inline_query,omitempty"`              // optional
 	SwitchInlineQueryCurrentChat *string       `json:"switch_inline_query_current_chat,omitempty"` // optional
 	CallbackGame                 *CallbackGame `json:"callback_game,omitempty"`                    // optional
-	Pay                          bool          `json:"pay"`
+	Pay                          bool          `json:"pay,omitempty"`			       // optional
 }
 
 // CallbackQuery is data sent when a keyboard button with callback data