--- a/cont.c
+++ b/cont.c
@@ -15,7 +15,7 @@
 #include "gc.h"
 #include "eval_intern.h"
 
-#if ((defined(_WIN32) && _WIN32_WINNT >= 0x0400) || (defined(HAVE_GETCONTEXT) && defined(HAVE_SETCONTEXT))) && !defined(__NetBSD__) && !defined(__sun) && !defined(__ia64) && !defined(FIBER_USE_NATIVE)
+#if ((defined(_WIN32) && _WIN32_WINNT >= 0x0400) || (defined(HAVE_GETCONTEXT) && defined(HAVE_SETCONTEXT))) && !defined(__NetBSD__) && !defined(__sun) && !defined(__ia64) && !defined(__GNU__) && !defined(FIBER_USE_NATIVE)
 #define FIBER_USE_NATIVE 1
 
 /* FIBER_USE_NATIVE enables Fiber performance improvement using system