--- a/testing/mozbase/mozprocess/tests/manifest.ini
+++ b/testing/mozbase/mozprocess/tests/manifest.ini
@@ -4,16 +4,14 @@
 [DEFAULT]
 # bug https://bugzilla.mozilla.org/show_bug.cgi?id=778267#c26
 skip-if = (os == "win")
 subsuite = mozbase, os == "linux"
 
 [test_mozprocess.py]
 disabled = bug 877864
 [test_mozprocess_kill.py]
-[test_mozprocess_kill_broad_wait.py]
-disabled = bug 921632
 [test_mozprocess_misc.py]
 [test_mozprocess_poll.py]
 [test_mozprocess_wait.py]
 [test_mozprocess_output.py]
 [test_mozprocess_params.py]
 [test_process_reader.py]

--- a/testing/mozbase/mozprocess/tests/test_mozprocess_kill.py
+++ b/testing/mozbase/mozprocess/tests/test_mozprocess_kill.py
@@ -66,16 +66,30 @@ class ProcTestKill(proctest.ProcTest):
         p = processhandler.ProcessHandler([self.python, self.proclaunch,
                                            "process_normal_broad_python.ini"],
                                           cwd=here)
         p.run()
         p.kill()
 
         self.determine_status(p, expectedfail=('returncode',))
 
+    def test_process_kill_broad_delayed(self):
+        """Process is started, we use a broad process tree, we let it spawn
+           for a bit, we kill it"""
+
+        p = processhandler.ProcessHandler([self.python, self.proclaunch,
+                                           "process_normal_broad_python.ini"],
+                                          cwd=here)
+        p.run()
+        # Let the tree spawn a bit, before attempting to kill
+        time.sleep(3)
+        p.kill()
+
+        self.determine_status(p, expectedfail=('returncode',))
+
     @unittest.skipUnless(processhandler.isPosix, "posix only")
     def test_process_kill_with_sigterm(self):
         script = os.path.join(here, 'infinite_loop.py')
         p = processhandler.ProcessHandler([self.python, script])
 
         p.run()
         p.kill()
 

deleted file mode 100644
--- a/testing/mozbase/mozprocess/tests/test_mozprocess_kill_broad_wait.py
+++ /dev/null
@@ -1,38 +0,0 @@
-#!/usr/bin/env python
-
-from __future__ import absolute_import
-
-import os
-import time
-import proctest
-
-import mozunit
-
-from mozprocess import processhandler
-
-here = os.path.dirname(os.path.abspath(__file__))
-
-
-class ProcTestKill(proctest.ProcTest):
-    """ Class to test various process tree killing scenatios """
-
-    # This test should ideally be a part of test_mozprocess_kill.py
-    # It has been separated for the purpose of tempporarily disabling it.
-    # See https://bugzilla.mozilla.org/show_bug.cgi?id=921632
-    def test_process_kill_broad_wait(self):
-        """Process is started, we use a broad process tree, we let it spawn
-           for a bit, we kill it"""
-
-        p = processhandler.ProcessHandler([self.python, self.proclaunch,
-                                           "process_normal_broad_python.ini"],
-                                          cwd=here)
-        p.run()
-        # Let the tree spawn a bit, before attempting to kill
-        time.sleep(3)
-        p.kill()
-
-        self.determine_status(p, expectedfail=('returncode',))
-
-
-if __name__ == '__main__':
-    mozunit.main()