diff --git a/src/sha256.c b/src/sha256.c
index a44e22e..52e13a9 100644
--- a/src/sha256.c
+++ b/src/sha256.c
@@ -47,7 +47,6 @@
 
 #include <string.h>
 #include <stdint.h>
-#include <stdlib.h>
 #include "sha256.h"
 
 #define SHA256_MASK (SHA256_BLOCK_SIZE - 1)
diff --git a/src/sha512.c b/src/sha512.c
index fbb6bcf..4931a31 100644
--- a/src/sha512.c
+++ b/src/sha512.c
@@ -32,7 +32,6 @@
 
 #include <string.h>
 #include <stdint.h>
-#include <stdlib.h>
 #include "sha512.h"
 
 #define SHA512_MASK (SHA512_BLOCK_SIZE - 1)