diff -uNr tigervnc-1.9.0/common/os/Thread.cxx tigervnc-1.9.0.mod/common/os/Thread.cxx
--- tigervnc-1.9.0/common/os/Thread.cxx	2018-07-16 17:08:55.000000000 +0300
+++ tigervnc-1.9.0.mod/common/os/Thread.cxx	2018-09-12 11:14:21.776323226 +0300
@@ -48,7 +48,7 @@
   delete (HANDLE*)threadId;
 #else
   if (isRunning())
-    pthread_cancel(*(pthread_t*)threadId);
+    pthread_kill(*(pthread_t*)threadId, SIGABRT);
   delete (pthread_t*)threadId;
 #endif