diff --git a/payload_consumer/postinstall_runner_action_unittest.cc b/payload_consumer/postinstall_runner_action_unittest.cc
index 04c81fa..84f2c2c 100644
--- a/payload_consumer/postinstall_runner_action_unittest.cc
+++ b/payload_consumer/postinstall_runner_action_unittest.cc
@@ -142,7 +142,14 @@
           base::TimeDelta::FromMilliseconds(10));
     } else {
       CHECK(processor_);
-      processor_->StopProcessing();
+      // Must |PostDelayedTask()| here to be safe that |FileDescriptorWatcher|
+      // doesn't leak memory, do not directly call |StopProcessing()|.
+      loop_.PostDelayedTask(
+          FROM_HERE,
+          base::Bind(
+              [](ActionProcessor* processor) { processor->StopProcessing(); },
+              base::Unretained(processor_)),
+          base::TimeDelta::FromMilliseconds(100));
     }
   }