1 files changed, 1 insertions, 0 deletions
diff --git a/thread.c b/thread.c
index 0f8b512405..52304f7efb 100644
--- a/thread.c
+++ b/thread.c
@@ -70,6 +70,7 @@
 #include "ruby/thread.h"
 #include "ruby/thread_native.h"
 #include "ruby/debug.h"
+#include "gc.h"
 #include "internal.h"
 #include "iseq.h"
 #include "vm_core.h"