diff --git a/win/rfb_win32/FolderManager.cxx b/win/rfb_win32/FolderManager.cxx
index a2fa08d..3ab49a1 100644
--- a/win/rfb_win32/FolderManager.cxx
+++ b/win/rfb_win32/FolderManager.cxx
@@ -230,14 +230,14 @@
   LARGE_INTEGER uli;
   uli.LowPart = ftime.dwLowDateTime;
   uli.HighPart = ftime.dwHighDateTime;
-  uli.QuadPart = (uli.QuadPart - 116444736000000000) / 10000000;
+  uli.QuadPart = (uli.QuadPart - 116444736000000000LL) / 10000000;
   return uli.LowPart;
 }
 
 void 
 FolderManager::getFiletime(unsigned int time70, FILETIME *pftime)
 {
-  LONGLONG ll = Int32x32To64(time70, 10000000) + 116444736000000000;
+  LONGLONG ll = Int32x32To64(time70, 10000000) + 116444736000000000LL;
   pftime->dwLowDateTime = (DWORD) ll;
   pftime->dwHighDateTime = (DWORD) (ll >> 32);
 }
@@ -276,4 +276,4 @@
   
   *dirSize = dirFileSize64;
   return true;
-}
\ No newline at end of file
+}