diff -r ab75d9ba107f asyncio/unix_events.py
--- a/asyncio/unix_events.py	Wed Nov 05 15:30:16 2014 +0100
+++ b/asyncio/unix_events.py	Tue Nov 11 00:30:19 2014 +0100
@@ -13,6 +13,7 @@
 from . import base_events
 from . import base_subprocess
 from . import constants
+from . import coroutines
 from . import events
 from . import selector_events
 from . import selectors
@@ -66,6 +67,8 @@
         Raise ValueError if the signal number is invalid or uncatchable.
         Raise RuntimeError if there is a problem setting up the handler.
         """
+        if coroutines.iscoroutinefunction(callback):
+            raise TypeError("coroutines cannot be used with call_soon()")
         self._check_signal(sig)
         try:
             # set_wakeup_fd() raises ValueError if this is not the
diff -r ab75d9ba107f tests/test_unix_events.py
--- a/tests/test_unix_events.py	Wed Nov 05 15:30:16 2014 +0100
+++ b/tests/test_unix_events.py	Tue Nov 11 00:30:19 2014 +0100
@@ -64,6 +64,18 @@
             signal.SIGINT, lambda: True)
 
     @mock.patch('asyncio.unix_events.signal')
+    def test_add_signal_handler_coroutine_error(self, m_signal):
+
+        @asyncio.coroutine
+        def simple_coroutine():
+            yield from []
+
+        self.assertRaises(
+            TypeError,
+            self.loop.add_signal_handler,
+            signal.SIGINT, simple_coroutine)
+
+    @mock.patch('asyncio.unix_events.signal')
     def test_add_signal_handler(self, m_signal):
         m_signal.NSIG = signal.NSIG