diff --git a/qutebrowser/misc/guiprocess.py b/qutebrowser/misc/guiprocess.py
index eb0a036e5..16bbbb3ba 100644
--- a/qutebrowser/misc/guiprocess.py
+++ b/qutebrowser/misc/guiprocess.py
@@ -142,12 +142,14 @@ class GUIProcess(QObject):
             self._proc.start(cmd, args)
         else:
             self._proc.start(cmd, args, mode)
+        self._proc.closeWriteChannel();
 
     def start_detached(self, cmd, args, cwd=None):
         """Convenience wrapper around QProcess::startDetached."""
         log.procs.debug("Starting detached.")
         self._pre_start(cmd, args)
         ok, _pid = self._proc.startDetached(cmd, args, cwd)
+        self._proc.closeWriteChannel();
 
         if ok:
             log.procs.debug("Process started.")