diff --git a/integration/conftest.py b/integration/conftest.py
index 1679bd9f9..533cbdb67 100644
--- a/integration/conftest.py
+++ b/integration/conftest.py
@@ -40,7 +40,8 @@ from util import (
     TahoeProcess,
     cli,
     _run_node,
-    generate_ssh_key
+    generate_ssh_key,
+    block_with_timeout,
 )
 
 
@@ -156,7 +157,7 @@ def flog_gatherer(reactor, temp_dir, flog_binary, request):
         )
         print("Waiting for flogtool to complete")
         try:
-            pytest_twisted.blockon(flog_protocol.done)
+            block_with_timeout(flog_protocol.done, reactor)
         except ProcessTerminated as e:
             print("flogtool exited unexpectedly: {}".format(str(e)))
         print("Flogtool completed")
@@ -297,7 +298,7 @@ log_gatherer.furl = {log_furl}
     def cleanup():
         try:
             transport.signalProcess('TERM')
-            pytest_twisted.blockon(protocol.exited)
+            block_with_timeout(protocol.exited, reactor)
         except ProcessExitedAlready:
             pass
     request.addfinalizer(cleanup)
@@ -537,7 +538,7 @@ def tor_network(reactor, temp_dir, chutney, request):
             env=env,
         )
         try:
-            pytest_twisted.blockon(proto.done)
+            block_with_timeout(proto.done, reactor)
         except ProcessTerminated:
             # If this doesn't exit cleanly, that's fine, that shouldn't fail
             # the test suite.
diff --git a/integration/util.py b/integration/util.py
index f5f7029d8..3d1708bae 100644
--- a/integration/util.py
+++ b/integration/util.py
@@ -28,6 +28,12 @@ from allmydata import client
 import pytest_twisted
 
 
+def block_with_timeout(deferred, reactor, timeout=10):
+    """Block until Deferred has result, but timeout instead of waiting forever."""
+    deferred.addTimeout(timeout, reactor)
+    return pytest_twisted.blockon(deferred)
+
+
 class _ProcessExitedProtocol(ProcessProtocol):
     """
     Internal helper that .callback()s on self.done when the process
@@ -126,11 +132,12 @@ def _cleanup_tahoe_process(tahoe_transport, exited):
 
     :return: After the process has exited.
     """
+    from twisted.internet import reactor
     try:
         print("signaling {} with TERM".format(tahoe_transport.pid))
         tahoe_transport.signalProcess('TERM')
         print("signaled, blocking on exit")
-        pytest_twisted.blockon(exited)
+        block_with_timeout(exited, reactor)
         print("exited, goodbye")
     except ProcessExitedAlready:
         pass