diff --git a/websockify/websocketproxy.py b/websockify/websocketproxy.py
index 5dbe643..8bd67ec 100755
--- a/websockify/websocketproxy.py
+++ b/websockify/websocketproxy.py
@@ -11,7 +11,7 @@ as taken from http://docs.python.org/dev/library/ssl.html#certificates
 
 '''
 
-import socket, optparse, time, os, sys, subprocess
+import signal, socket, optparse, time, os, sys, subprocess
 from select import select
 import websocket
 try:    from urllib.parse import parse_qs, urlparse
@@ -87,7 +87,7 @@ Traffic Legend:
         self.wrap_times.append(time.time())
         self.wrap_times.pop(0)
         self.cmd = subprocess.Popen(
-                self.wrap_cmd, env=os.environ)
+                self.wrap_cmd, env=os.environ, preexec_fn=_subprocess_setup)
         self.spawn_message = True
 
     def started(self):
@@ -144,7 +144,7 @@ Traffic Legend:
                 else:
                     self.run_wrap_cmd()
 
-    # 
+    #
     # Routines above this point are run in the master listener
     # process.
     #
@@ -171,7 +171,7 @@ Traffic Legend:
         else:
             msg = "connecting to: %s:%s" % (
                                     self.target_host, self.target_port)
-        
+
         if self.ssl_target:
             msg += " (using SSL)"
         self.msg(msg)
@@ -291,6 +291,13 @@ Traffic Legend:
                         self.target_host, self.target_port))
                     raise self.CClose(closed['code'], closed['reason'])
 
+
+def _subprocess_setup():
+    # Python installs a SIGPIPE handler by default. This is usually not what
+    # non-Python successfulbprocesses expect.
+    signal.signal(signal.SIGPIPE, signal.SIG_DFL)
+
+
 def websockify_init():
     usage = "\n    %prog [options]"
     usage += " [source_addr:]source_port [target_addr:target_port]"
@@ -338,7 +345,7 @@ def websockify_init():
     (opts, args) = parser.parse_args()
 
     # Sanity checks
-    if len(args) < 2 and not opts.target_cfg:
+    if len(args) < 2 and not (opts.target_cfg or opts.unix_target):
         parser.error("Too few arguments")
     if sys.argv.count('--'):
         opts.wrap_cmd = args[1:]
@@ -349,7 +356,7 @@ def websockify_init():
 
     if not websocket.ssl and opts.ssl_target:
         parser.error("SSL target requested and Python SSL module not loaded.");
-        
+
     if opts.ssl_only and not os.path.exists(opts.cert):
         parser.error("SSL only and %s not found" % opts.cert)