1 files changed, 1 insertions, 1 deletions
diff --git a/lib/md5.h b/lib/md5.h
index f1a6857..2da44bf 100644
--- a/lib/md5.h
+++ b/lib/md5.h
@@ -39,7 +39,7 @@ typedef struct {
 } MD5_CTX;
 
 extern void MD5_Init(MD5_CTX *ctx);
-extern void MD5_Update(MD5_CTX *ctx, void *data, unsigned long size);
+extern void MD5_Update(MD5_CTX *ctx, const void *data, unsigned long size);
 extern void MD5_Final(unsigned char *result, MD5_CTX *ctx);
 
 #endif