diff --git a/include/wx/msw/private/fswatcher.h b/include/wx/msw/private/fswatcher.h
index 55c2aab927..43397c136f 100644
--- a/include/wx/msw/private/fswatcher.h
+++ b/include/wx/msw/private/fswatcher.h
@@ -236,7 +236,7 @@ public:
     // This function can block forever in it's wait for completion status.
     // Use PostEmptyStatus() to wake it up (and end the worker thread)
     Status
-    GetStatus(unsigned long* count, wxFSWatchEntryMSW** watch,
+    GetStatus(DWORD* count, wxFSWatchEntryMSW** watch,
               OVERLAPPED** overlapped)
     {
         wxCHECK_MSG( m_iocp != INVALID_HANDLE_VALUE, Status_Error,
diff --git a/src/msw/fswatcher.cpp b/src/msw/fswatcher.cpp
index cbfc0a8860..7269112f52 100644
--- a/src/msw/fswatcher.cpp
+++ b/src/msw/fswatcher.cpp
@@ -221,7 +221,7 @@ wxThread::ExitCode wxIOCPThread::Entry()
 //         true otherwise
 bool wxIOCPThread::ReadEvents()
 {
-    unsigned long count = 0;
+    DWORD count = 0;
     wxFSWatchEntryMSW* watch = NULL;
     OVERLAPPED* overlapped = NULL;
     switch ( m_iocp->GetStatus(&count, &watch, &overlapped) )