diff --git a/include/mbedtls/mbedtls_config.h b/include/mbedtls/mbedtls_config.h
index 28f0a0056e..e43c12d7e5 100644
--- a/include/mbedtls/mbedtls_config.h
+++ b/include/mbedtls/mbedtls_config.h
@@ -387,7 +387,6 @@
  *            implementation should be provided for mbedtls_ecdsa_sign_det_ext().
  *
  */
-//#define MBEDTLS_SHA1_PROCESS_ALT
 //#define MBEDTLS_SHA256_PROCESS_ALT
 //#define MBEDTLS_SHA512_PROCESS_ALT
 //#define MBEDTLS_DES_SETKEY_ALT
diff --git a/tf-psa-crypto/drivers/builtin/src/sha1.c b/tf-psa-crypto/drivers/builtin/src/sha1.c
index c8d2852d45..b13381d30a 100644
--- a/tf-psa-crypto/drivers/builtin/src/sha1.c
+++ b/tf-psa-crypto/drivers/builtin/src/sha1.c
@@ -59,7 +59,6 @@ int mbedtls_sha1_starts(mbedtls_sha1_context *ctx)
     return 0;
 }
 
-#if !defined(MBEDTLS_SHA1_PROCESS_ALT)
 int mbedtls_internal_sha1_process(mbedtls_sha1_context *ctx,
                                   const unsigned char data[64])
 {
@@ -228,8 +227,6 @@ int mbedtls_internal_sha1_process(mbedtls_sha1_context *ctx,
     return 0;
 }
 
-#endif /* !MBEDTLS_SHA1_PROCESS_ALT */
-
 /*
  * SHA-1 process buffer
  */