diff --git a/include/mbedtls/ssl_internal.h b/include/mbedtls/ssl_internal.h
index f3de299..83047c5 100644
--- a/include/mbedtls/ssl_internal.h
+++ b/include/mbedtls/ssl_internal.h
@@ -1307,7 +1307,7 @@
 #endif /* MBEDTLS_SSL_PROTO_DTLS */
 
 #if defined(MBEDTLS_TEST_HOOKS)
-int ssl_check_dtls_clihlo_cookie(
+int mbedtls_ssl_check_dtls_clihlo_cookie(
                           mbedtls_ssl_context *ssl,
                           const unsigned char *cli_id, size_t cli_id_len,
                           const unsigned char *in, size_t in_len,