diff --git a/library/x509.c b/library/x509.c
index e438770..88e32b0 100644
--- a/library/x509.c
+++ b/library/x509.c
@@ -1035,7 +1035,7 @@
  */
 int mbedtls_x509_self_test( int verbose )
 {
-#if defined(MBEDTLS_CERTS_C) && defined(MBEDTLS_SHA1_C)
+#if defined(MBEDTLS_CERTS_C) && defined(MBEDTLS_SHA256_C)
     int ret;
     uint32_t flags;
     mbedtls_x509_crt cacert;