1 files changed, 1 insertions, 1 deletions
diff --git a/thread.c b/thread.c
index 38b524e1bc..2ad443807d 100644
--- a/thread.c
+++ b/thread.c
@@ -2702,7 +2702,7 @@ rb_thread_fd_select(int max, rb_fdset_t * read, rb_fdset_t * write, rb_fdset_t *
  * one we know of that supports using poll() in all places select()
  * would work.
  */
-#if defined(HAVE_POLL) && defined(linux)
+#if defined(HAVE_POLL) && defined(__linux__)
 #  define USE_POLL
 #endif