diff --git a/include/icsneo/communication/message/extendedresponsemessage.h b/include/icsneo/communication/message/extendedresponsemessage.h
index 0ebaf3c..04361ad 100644
--- a/include/icsneo/communication/message/extendedresponsemessage.h
+++ b/include/icsneo/communication/message/extendedresponsemessage.h
@@ -16,7 +16,7 @@ public:
 	const ExtendedCommand command;
 	const ExtendedResponse response;
 
-#pragma pack(push, 1)
+#pragma pack(push, 2)
 	struct ResponseHeader {
 		ExtendedCommand command;
 		uint16_t length;