diff --git a/src/Sha/Sha1.c b/src/Sha/Sha1.c
index 9dd3bf4..edd250f 100644
--- a/src/Sha/Sha1.c
+++ b/src/Sha/Sha1.c
@@ -60,7 +60,7 @@ typedef struct
 } Sha1Context;
 
 static void
-Sha1Transform(uint32_t state[5], const uint8_t buffer[64])
+Sha1Transform(uint32_t state[5], const uint8_t *buffer)
 {
     uint32_t a, b, c, d, e, i;
     uint8_t workspace[64];