# define OS_VM_SIZE_FMT "u"
# define OS_VM_SIZE_FMTX "x"
#else
+#if defined(LISP_FEATURE_SB_WIN32)
+# define OS_VM_SIZE_FMT "Iu"
+# define OS_VM_SIZE_FMTX "Ix"
+#else
# define OS_VM_SIZE_FMT "lu"
# define OS_VM_SIZE_FMTX "lx"
#endif
+#endif
/* FIXME: this is not the right place for this, but here we have
* a convenient base type to hand. If it turns out we can just use