1 files changed, 1 insertions, 0 deletions

diff --git a/main.c b/main.c
index e89f987cc0..a782939ff3 100644
--- a/main.c
+++ b/main.c
@@ -11,6 +11,7 @@
 
 #undef RUBY_EXPORT
 #include "ruby.h"
+#include "debug.h"
 #ifdef HAVE_LOCALE_H
 #include <locale.h>
 #endif