diff --git a/include/telebotxx/Attachment.hpp b/include/telebotxx/Attachment.hpp
index c4a16b3..4abdb42 100644
--- a/include/telebotxx/Attachment.hpp
+++ b/include/telebotxx/Attachment.hpp
@@ -208,6 +208,7 @@ namespace telebotxx
 	};
 
 	void swap(PhotoSize& lhs, PhotoSize& rhs);
+	void swap(PhotoSizeArray& lhs, PhotoSizeArray& rhs);
 	void swap(Audio& lhs, Audio& rhs);
 	void swap(Document& lhs, Document& rhs);
 	void swap(Sticker& lhs, Sticker& rhs);
diff --git a/src/Attachment.cpp b/src/Attachment.cpp
index 96fd2fa..be42972 100644
--- a/src/Attachment.cpp
+++ b/src/Attachment.cpp
@@ -389,6 +389,11 @@ void telebotxx::swap(PhotoSize& lhs, PhotoSize& rhs)
 	lhs.swap(rhs);
 }
 
+void telebotxx::swap(PhotoSizeArray& lhs, PhotoSizeArray& rhs)
+{
+	lhs.swap(rhs);
+}
+
 void telebotxx::swap(Audio& lhs, Audio& rhs)
 {
 	lhs.swap(rhs);