diff --git a/cont.c b/cont.c
index 539d1f48cc..d6cc367779 100644
--- cont.c
+++ cont.c
@@ -51,7 +51,7 @@
  */
 #     define FIBER_USE_NATIVE 0
 #   else
-#     define FIBER_USE_NATIVE 1
+#     define FIBER_USE_NATIVE 0
 #   endif
 # elif defined(_WIN32)
 #  define FIBER_USE_NATIVE 1