diff --git a/Python/condvar.h b/Python/condvar.h
--- a/Python/condvar.h
+++ b/Python/condvar.h
@@ -270,7 +270,7 @@
 }
 
 Py_LOCAL_INLINE(int)
-PyCOND_TIMEDWAIT(PyCOND_T *cv, PyMUTEX_T *cs, long us)
+PyCOND_TIMEDWAIT(PyCOND_T *cv, PyMUTEX_T *cs, DWORD us)
 {
     return _PyCOND_WAIT_MS(cv, cs, us/1000);
 }
@@ -363,7 +363,7 @@
  * 2 to indicate that we don't know.
  */
 Py_LOCAL_INLINE(int)
-PyCOND_TIMEDWAIT(PyCOND_T *cv, PyMUTEX_T *cs, long us)
+PyCOND_TIMEDWAIT(PyCOND_T *cv, PyMUTEX_T *cs, DWORD us)
 {
     return SleepConditionVariableSRW(cv, cs, us/1000, 0) ? 2 : -1;
 }