1 files changed, 2 insertions, 1 deletions
diff --git a/io.c b/io.c
index eeaf0c021c..fd4892fab3 100644
--- a/io.c
+++ b/io.c
@@ -11,9 +11,10 @@
 
 **********************************************************************/
 
-#include "internal.h"
+#include "ruby/encoding.h"
 #include "ruby/io.h"
 #include "ruby/thread.h"
+#include "internal.h"
 #include "dln.h"
 #include "encindex.h"
 #include "id.h"