diff --git a/client/Mac/MRDPView.h b/client/Mac/MRDPView.h
index 4cd7c68d3..6e4c3a4b8 100755
--- a/client/Mac/MRDPView.h
+++ b/client/Mac/MRDPView.h
@@ -1,3 +1,6 @@
+#ifndef MRDPVIEW_H
+#define MRDPVIEW_H
+
 /**
  * FreeRDP: A Remote Desktop Protocol Implementation
  * MacFreeRDP
@@ -97,3 +100,5 @@ BOOL mac_post_connect(freerdp*	instance);
 BOOL mac_authenticate(freerdp* instance, char** username, char** password, char** domain);
 int mac_receive_channel_data(freerdp* instance, int chan_id, BYTE* data, int size, int flags, int total_size);
 DWORD mac_client_thread(void* param);
+
+#endif // MRDPVIEW_H