1 files changed, 1 insertions, 1 deletions
diff --git a/signal.c b/signal.c
index 02ec9d3ebc..9b4e15eec0 100644
--- a/signal.c
+++ b/signal.c
@@ -18,7 +18,7 @@
 #include <errno.h>
 #include "atomic.h"
 
-#if !defined(_WIN32) && !defined(HAVE_GCC_ATOMIC_BUILTINS)
+#ifdef NEED_RUBY_ATOMIC_EXCHANGE
 rb_atomic_t
 ruby_atomic_exchange(rb_atomic_t *ptr, rb_atomic_t val)
 {