diff --git a/programs/test/udp_proxy.c b/programs/test/udp_proxy.c
index 43d2e8c..6e9ebf9 100644
--- a/programs/test/udp_proxy.c
+++ b/programs/test/udp_proxy.c
@@ -12,6 +12,8 @@
  */
 
 
+#define MBEDTLS_DECLARE_PRIVATE_IDENTIFIERS
+
 #include "mbedtls/build_info.h"
 
 #if defined(MBEDTLS_PLATFORM_C)