diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -313,6 +313,7 @@
 
 check_include_file("sys/prctl.h" HAVE_SYS_PRCTL_H)
 check_symbol_exists(PR_SET_DUMPABLE "sys/prctl.h" HAVE_PR_SET_DUMPABLE)
+check_symbol_exists(PR_SET_PDEATHSIG "sys/prctl.h" HAVE_PR_SET_PDEATHSIG)
 check_include_file("sys/procctl.h" HAVE_SYS_PROCCTL_H)
 check_symbol_exists(PROC_TRACE_CTL "sys/procctl.h" HAVE_PROC_TRACE_CTL)
 if (HAVE_PR_SET_DUMPABLE OR HAVE_PROC_TRACE_CTL)
diff --git a/config-kwin.h.cmake b/config-kwin.h.cmake
--- a/config-kwin.h.cmake
+++ b/config-kwin.h.cmake
@@ -18,6 +18,7 @@
 #cmakedefine01 HAVE_WAYLAND_EGL
 #cmakedefine01 HAVE_SYS_PRCTL_H
 #cmakedefine01 HAVE_PR_SET_DUMPABLE
+#cmakedefine01 HAVE_PR_SET_PDEATHSIG
 #cmakedefine01 HAVE_SYS_PROCCTL_H
 #cmakedefine01 HAVE_PROC_TRACE_CTL
 #cmakedefine01 HAVE_BREEZE_DECO
diff --git a/helpers/xclipboardsync/main.cpp b/helpers/xclipboardsync/main.cpp
--- a/helpers/xclipboardsync/main.cpp
+++ b/helpers/xclipboardsync/main.cpp
@@ -21,8 +21,17 @@
 
 #include <QGuiApplication>
 
+#include <config-kwin.h>
+#if HAVE_PR_SET_PDEATHSIG
+#include <sys/prctl.h>
+#include <signal.h>
+#endif
+
 int main(int argc, char *argv[])
 {
+#if HAVE_PR_SET_PDEATHSIG
+    prctl(PR_SET_PDEATHSIG, SIGTERM);
+#endif
     qputenv("QT_QPA_PLATFORM", "xcb");
     QGuiApplication app(argc, argv);
     // perform sanity checks