diff --git a/Lib/subprocess.py b/Lib/subprocess.py
index e94fc2c..d3e9692 100644
--- a/Lib/subprocess.py
+++ b/Lib/subprocess.py
@@ -375,7 +375,7 @@
 
 def _cleanup():
     for inst in _active[:]:
-        res = inst.poll(_deadstate=sys.maxsize)
+        res = inst._internal_poll(_deadstate=sys.maxsize)
         if res is not None and res >= 0:
             try:
                 _active.remove(inst)
@@ -635,7 +635,7 @@
             # We didn't get to successfully create a child process.
             return
         # In case the child hasn't been waited on, check if it's done.
-        self.poll(_deadstate=sys.maxsize)
+        self._internal_poll(_deadstate=sys.maxsize)
         if self.returncode is None and _active is not None:
             # Child is still running, keep us alive until we can wait on it.
             _active.append(self)
@@ -671,6 +671,10 @@
         return self._communicate(input)
 
 
+    def poll(self):
+        return self._internal_poll()
+
+
     if mswindows:
         #
         # Windows methods
@@ -842,7 +846,7 @@
                 errwrite.Close()
 
 
-        def poll(self, _deadstate=None):
+        def _internal_poll(self, _deadstate=None):
             """Check if child process has terminated.  Returns returncode
             attribute."""
             if self.returncode is None:
@@ -1103,7 +1107,7 @@
                 raise RuntimeError("Unknown child exit status!")
 
 
-        def poll(self, _deadstate=None):
+        def _internal_poll(self, _deadstate=None):
             """Check if child process has terminated.  Returns returncode
             attribute."""
             if self.returncode is None: