diff --git a/extmod/crypto-algorithms/sha256.c b/extmod/crypto-algorithms/sha256.c
index 82e5d9c7bd..276611cfd5 100644
--- a/extmod/crypto-algorithms/sha256.c
+++ b/extmod/crypto-algorithms/sha256.c
@@ -14,7 +14,6 @@
 
 /*************************** HEADER FILES ***************************/
 #include <stdlib.h>
-#include <memory.h>
 #include "sha256.h"
 
 /****************************** MACROS ******************************/