1 files changed, 2 insertions, 2 deletions
diff --git a/rubyio.h b/rubyio.h
index 6e63711ee9..fb012045f1 100644
--- a/rubyio.h
+++ b/rubyio.h
@@ -10,8 +10,8 @@
 
 **********************************************************************/
 
-#ifndef IO_H
-#define IO_H
+#ifndef RUBYIO_H
+#define RUBYIO_H
 
 #include <stdio.h>
 #include <errno.h>