diff --git a/nufxlib-0/SysDefs.h b/nufxlib-0/SysDefs.h
index 2a697dc..2629df7 100644
--- a/nufxlib-0/SysDefs.h
+++ b/nufxlib-0/SysDefs.h
@@ -103,7 +103,7 @@
 
 #if defined(WINDOWS_LIKE)
 # ifndef F_OK
-#  define F_OK 02
+#  define F_OK 0            /* was 02 in <= v1.1.0 */
 # endif
 #endif