diff --git a/HISTORY b/HISTORY
index b00ff4a..15639d0 100644
--- a/HISTORY
+++ b/HISTORY
@@ -1,6 +1,7 @@
 VDR Plugin 'streamdev' Revision History
 ---------------------------------------
  
+- API changes of VDR 1.7.38 (thanks to mal@vdr-developer)
 - Added simple recordings menu in HTTP server
 - Restructured menuHTTP classes
 - Added RSS format for HTTP menus
diff --git a/client/device.h b/client/device.h
index 71e42ed..1edf956 100644
--- a/client/device.h
+++ b/client/device.h
@@ -28,7 +28,11 @@ private:
 
 protected:
 	virtual bool SetChannelDevice(const cChannel *Channel, bool LiveView);
-	virtual bool HasLock(int TimeoutMs) 
+#if APIVERSNUM >= 10738
+	virtual bool HasLock(int TimeoutMs) const
+#else
+	virtual bool HasLock(int TimeoutMs)
+#endif
 	{
 		//printf("HasLock is %d\n", (ClientSocket.DataSocket(siLive) != NULL));
 		//return ClientSocket.DataSocket(siLive) != NULL;