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diff --git a/src/readwrite.h b/src/readwrite.h
index 28bc3ab..eeead6b 100644
--- a/src/readwrite.h
+++ b/src/readwrite.h
@@ -1,5 +1,12 @@
+#ifndef READWRITE_H
+#define READWRITE_H
+
+#include <stdio.h>
+#include <stdint.h>
+
 uint16_t read_uint16_bigendian(FILE * file);
 void write_uint16_bigendian(uint16_t x, FILE * file);
 uint32_t read_uint32_bigendian(FILE * file);
 void write_uint32_bigendian(uint32_t x, FILE * file);
 
+#endif