--- a/testing/mozbase/mozdevice/mozdevice/devicemanager.py
+++ b/testing/mozbase/mozdevice/mozdevice/devicemanager.py
@@ -460,19 +460,17 @@ class DeviceManager(object):
                 processInfo = proc
                 break
         return processInfo
 
     def processExist(self, processName):
         """
         Returns True if process with name processName is running on device.
         """
-        processInfo = self.processInfo(processName)
-        if processInfo:
-            return processInfo[0]
+        return self.processInfo(processName) is not None
 
     @abstractmethod
     def killProcess(self, processName, sig=None, native=False):
         """
         Kills the process named processName. If sig is not None, process is
         killed with the specified signal.
 
         :param processName: path or name of the process to kill