1 files changed, 3 insertions, 1 deletions
diff --git a/crc32.h b/crc32.h
index 72da4e0..6ea89b0 100644
--- a/crc32.h
+++ b/crc32.h
@@ -1,6 +1,8 @@
 #ifndef _CRC32_H_
 #define _CRC32_H_
 
-extern uint32_t crc32(uint32_t crc, unsigned char *buf, size_t len);
+#include <stdint.h>
+
+extern uint32_t crc32(uint32_t crc, const uint8_t *buf, size_t len);
 
 #endif /* _CRC32_H_ */