1 files changed, 1 insertions, 1 deletions
diff --git a/signal.c b/signal.c
index 5af01fe087..675076094f 100644
--- a/signal.c
+++ b/signal.c
@@ -702,7 +702,7 @@ rb_get_next_signal(void)
 
 #if defined(USE_SIGALTSTACK) || defined(_WIN32)
 NORETURN(void ruby_thread_stack_overflow(rb_thread_t *th));
-#if (defined(HAVE_UCONTEXT_H) && (defined __i386__ || defined __x86_64__))
+#if !(defined(HAVE_UCONTEXT_H) && (defined __i386__ || defined __x86_64__))
 #elif defined __linux__
 # define USE_UCONTEXT_REG 1
 #elif defined __APPLE__