diff --git a/bochs/iodev/cdrom.cc b/bochs/iodev/cdrom.cc
index bb8afb851..45b377ffc 100644
--- a/bochs/iodev/cdrom.cc
+++ b/bochs/iodev/cdrom.cc
@@ -510,7 +510,8 @@ cdrom_interface::cdrom_interface(const char *dev)
   bUseASPI = FALSE;
   osinfo.dwOSVersionInfoSize = sizeof(osinfo);
   GetVersionEx(&osinfo);
-  isWindowsXP = (osinfo.dwMajorVersion >= 5) && (osinfo.dwMinorVersion >= 1);
+  isWindowsXP = (osinfo.dwMajorVersion > 5) ||
+                ((osinfo.dwMajorVersion == 5) && (osinfo.dwMinorVersion >= 1));
 #endif
 }