1 files changed, 1 insertions, 0 deletions
diff --git a/gc.c b/gc.c
index e703471bf9..8886da0452 100644
--- a/gc.c
+++ b/gc.c
@@ -18,6 +18,7 @@
 #include "ruby/util.h"
 #include "eval_intern.h"
 #include "vm_core.h"
+#include "internal.h"
 #include "gc.h"
 #include "constant.h"
 #include <stdio.h>