diff --git a/libvncclient/rfbproto.c b/libvncclient/rfbproto.c
index 21e5088..3b5c9c2 100644
--- a/libvncclient/rfbproto.c
+++ b/libvncclient/rfbproto.c
@@ -1553,6 +1553,9 @@ HandleRFBServerMessage(rfbClient* client)
     if (!SendIncrementalFramebufferUpdateRequest(client))
       return FALSE;
 
+    if (client->FinishedFrameBufferUpdate)
+      client->FinishedFrameBufferUpdate(client);
+
     break;
   }
 
diff --git a/libvncclient/vncviewer.c b/libvncclient/vncviewer.c
index a5f2f89..7e678fb 100644
--- a/libvncclient/vncviewer.c
+++ b/libvncclient/vncviewer.c
@@ -173,6 +173,7 @@ rfbClient* rfbGetClient(int bitsPerSample,int samplesPerPixel,
   client->SoftCursorLockArea = DummyRect;
   client->SoftCursorUnlockScreen = Dummy;
   client->GotFrameBufferUpdate = DummyRect;
+  client->FinishedFrameBufferUpdate = NULL;
   client->GetPassword = ReadPassword;
   client->MallocFrameBuffer = MallocFrameBuffer;
   client->Bell = Dummy;
diff --git a/rfb/rfbclient.h b/rfb/rfbclient.h
index 07da7df..40c1775 100644
--- a/rfb/rfbclient.h
+++ b/rfb/rfbclient.h
@@ -107,6 +107,7 @@ typedef rfbBool (*HandleCursorPosProc)(struct _rfbClient* client, int x, int y);
 typedef void (*SoftCursorLockAreaProc)(struct _rfbClient* client, int x, int y, int w, int h);
 typedef void (*SoftCursorUnlockScreenProc)(struct _rfbClient* client);
 typedef void (*GotFrameBufferUpdateProc)(struct _rfbClient* client, int x, int y, int w, int h);
+typedef void (*FinishedFrameBufferUpdateProc)(struct _rfbClient* client);
 typedef char* (*GetPasswordProc)(struct _rfbClient* client);
 typedef rfbBool (*MallocFrameBufferProc)(struct _rfbClient* client);
 typedef void (*GotXCutTextProc)(struct _rfbClient* client, const char *text, int textlen);
@@ -228,6 +229,7 @@ typedef struct _rfbClient {
 	SoftCursorLockAreaProc SoftCursorLockArea;
 	SoftCursorUnlockScreenProc SoftCursorUnlockScreen;
 	GotFrameBufferUpdateProc GotFrameBufferUpdate;
+	FinishedFrameBufferUpdateProc FinishedFrameBufferUpdate;
 	/* the pointer returned by GetPassword will be freed after use! */
 	GetPasswordProc GetPassword;
 	MallocFrameBufferProc MallocFrameBuffer;