Suppress undef warnings for USE_RUBY_DEBUG_LOG

(cherry picked from commit 975a6efd7ea144275d4774d18ff0f568c1a1dc97)

1 files changed, 1 insertions, 1 deletions

diff --git a/ractor.c b/ractor.c
index d6559dfc2a..3c05964e91 100644
--- a/ractor.c
+++ b/ractor.c
@@ -545,7 +545,7 @@ ractor_sleep_interrupt(void *ptr)
     RACTOR_UNLOCK(r);
 }
 
-#if USE_RUBY_DEBUG_LOG
+#if defined(USE_RUBY_DEBUG_LOG) && USE_RUBY_DEBUG_LOG
 static const char *
 wait_status_str(enum ractor_wait_status wait_status)
 {