1 files changed, 1 insertions, 0 deletions
diff --git a/debug.c b/debug.c
index c143046fe7..a467967f54 100644
--- a/debug.c
+++ b/debug.c
@@ -11,6 +11,7 @@
 **********************************************************************/
 
 #include "ruby.h"
+#include "debug.h"
 
 void
 debug_indent(int level, int debug_level, int indent_level)