diff --git a/library/x509.c b/library/x509.c
index 0d4295105..14ec3222c 100644
--- a/library/x509.c
+++ b/library/x509.c
@@ -1016,7 +1016,7 @@ int mbedtls_x509_self_test( int verbose )
     return( 0 );
 #else
     ((void) verbose);
-    return( MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE );
+    return( 0 );
 #endif /* MBEDTLS_CERTS_C && MBEDTLS_SHA1_C */
 }