diff --git a/src/sha256/SHA256.h b/src/sha256/SHA256.h
index 5b99e62..d10ed49 100644
--- a/src/sha256/SHA256.h
+++ b/src/sha256/SHA256.h
@@ -10,7 +10,7 @@
 
 #pragma once
 
-#include "sha256.h"
+#include "sha2.h"
 
 class SHA256 {
 
diff --git a/src/sha256/sha256.c b/src/sha256/sha2.c
similarity index 99%
rename from src/sha256/sha256.c
rename to src/sha256/sha2.c
index 0ed6805..e0337d6 100644
--- a/src/sha256/sha256.c
+++ b/src/sha256/sha2.c
@@ -34,7 +34,7 @@
 #define UNROLL_LOOPS /* Enable loops unrolling */
 #endif
 
-#include "sha256.h"
+#include "sha2.h"
 
 #define SHFR(x, n)    (x >> n)
 #define ROTR(x, n)   ((x >> n) | (x << ((sizeof (x) << 3) - n)))
diff --git a/src/sha256/sha256.h b/src/sha256/sha2.h
similarity index 99%
rename from src/sha256/sha256.h
rename to src/sha256/sha2.h
index 907e383..d6de3a6 100644
--- a/src/sha256/sha256.h
+++ b/src/sha256/sha2.h
@@ -35,6 +35,7 @@
 
 #include <stdint.h>
 #include <stddef.h>
+#include <string.h>
 
 #define SHA256_DIGEST_SIZE ( 256 / 8)
 #define SHA256_BLOCK_SIZE  ( 512 / 8)