diff --git a/telegrambots-meta/src/main/java/org/telegram/telegrambots/meta/api/methods/AnswerInlineQuery.java b/telegrambots-meta/src/main/java/org/telegram/telegrambots/meta/api/methods/AnswerInlineQuery.java
index 80fb9434..5c341c80 100644
--- a/telegrambots-meta/src/main/java/org/telegram/telegrambots/meta/api/methods/AnswerInlineQuery.java
+++ b/telegrambots-meta/src/main/java/org/telegram/telegrambots/meta/api/methods/AnswerInlineQuery.java
@@ -136,8 +136,8 @@ public class AnswerInlineQuery extends BotApiMethod<Boolean> {
             if (switchPmParameter.length() > 64) {
                 throw new TelegramApiValidationException("SwitchPmParameter can't be longer than 64 chars", this);
             }
-            if (!Pattern.matches("[A-Za-z0-9_]+", switchPmParameter.trim() )) {
-                throw new TelegramApiValidationException("SwitchPmParameter only allows A-Z, a-z, 0-9 and _ characters", this);
+            if (!Pattern.matches("[A-Za-z0-9_\\-]+", switchPmParameter.trim() )) {
+                throw new TelegramApiValidationException("SwitchPmParameter only allows A-Z, a-z, 0-9, _ and - characters", this);
             }
         }
         for (InlineQueryResult result : results) {