1 files changed, 1 insertions, 0 deletions
diff --git a/gc.c b/gc.c
index a7a6a16d18..f0d342aef7 100644
--- a/gc.c
+++ b/gc.c
@@ -21,6 +21,7 @@
 #include "internal.h"
 #include "gc.h"
 #include "constant.h"
+#include "ruby_atomic.h"
 #include <stdio.h>
 #include <setjmp.h>
 #include <sys/types.h>