diff --git a/src/ecc.c b/src/ecc.c
index 90eb62d..1d63466 100644
--- a/src/ecc.c
+++ b/src/ecc.c
@@ -9,6 +9,7 @@ const uint8_t SM2_ID_DEFAULT[] = {0x10, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37
                                   0x36, 0x37, 0x38};
 
 #ifdef USE_MBEDCRYPTO
+#include <sha.h>
 #include <mbedtls/bn_mul.h>
 #include <mbedtls/ecdsa.h>