diff --git a/crypto/async/arch/async_null.h b/crypto/async/arch/async_null.h
index 684e373b48f033c548ada44bfc0338186cca19bb..72a888a89b6154d4cc9431bcf0013ce81c919127 100644
--- a/crypto/async/arch/async_null.h
+++ b/crypto/async/arch/async_null.h
@@ -69,7 +69,7 @@ typedef struct async_fibre_st {
 # define async_set_ctx(nctx)                    0
 # define async_get_ctx()                        ((async_ctx *)NULL)
 # define async_fibre_swapcontext(o,n,r)         0
-# define async_fibre_makecontext(c)
+# define async_fibre_makecontext(c)             0
 # define async_fibre_free(f)
 # define async_fibre_init_dispatcher(f)
 # define async_get_pool()                       NULL