diff --git a/src/libvncclient/rfbclient.c b/src/libvncclient/rfbclient.c
index a4eec218..f9f8ccc5 100644
--- a/src/libvncclient/rfbclient.c
+++ b/src/libvncclient/rfbclient.c
@@ -1967,7 +1967,7 @@ rfbClientProcessExtServerCutText(rfbClient* client, char *data, int len)
     return FALSE;
   }
   if (client->GotXCutTextUTF8)
-    client->GotXCutTextUTF8(client, buf, size);
+    client->GotXCutTextUTF8(client, (char *)buf, size);
   free(buf);
 
   inflateEnd(&stream);