diff --git a/base/io.h b/base/file_io.h
similarity index 97%
rename from base/io.h
rename to base/file_io.h
index 47eb974..427038b 100644
--- a/base/io.h
+++ b/base/file_io.h
@@ -1,6 +1,6 @@
 #pragma once
-#ifndef IO_H
-#define IO_H
+#ifndef FILE_IO_H
+#define FILE_IO_H
 
 #include "MMBitmap.h"
 #include <stddef.h>
diff --git a/base/io_c.h b/base/file_io_c.h
similarity index 98%
rename from base/io_c.h
rename to base/file_io_c.h
index fed799a..e2d7180 100644
--- a/base/io_c.h
+++ b/base/file_io_c.h
@@ -1,4 +1,4 @@
-#include "io.h"
+#include "file_io.h"
 // #include "os.h"
 // #include "bmp_io_c.h"
 #include "png_io_c.h"
diff --git a/base/png_io.h b/base/png_io.h
index 4662334..0187ce3 100644
--- a/base/png_io.h
+++ b/base/png_io.h
@@ -3,7 +3,7 @@
 #define PNG_IO_H
 
 // #include "MMBitmap_c.h"
-// #include "io_c.h"
+// #include "file_io_c.h"
 
 enum _PNGReadError {
 	kPNGGenericError = 0,
diff --git a/bitmap/goBitmap.h b/bitmap/goBitmap.h
index a9438de..8391dee 100644
--- a/bitmap/goBitmap.h
+++ b/bitmap/goBitmap.h
@@ -12,7 +12,7 @@
 #include "bitmap_find_c.h"
 #include "../base/color_find_c.h"
 // #include "../screen/screen_c.h"
-#include "../base/io_c.h"
+#include "../base/file_io_c.h"
 #include "../base/pasteboard_c.h"
 #include "../base/str_io_c.h"
 #include <assert.h>