diff --git a/programs/ssl/dtls_client.c b/programs/ssl/dtls_client.c
index d3885aa..4052975 100644
--- a/programs/ssl/dtls_client.c
+++ b/programs/ssl/dtls_client.c
@@ -59,6 +59,7 @@
 #include "mbedtls/ctr_drbg.h"
 #include "mbedtls/error.h"
 #include "mbedtls/certs.h"
+#include "mbedtls/timing.h"
 
 #define SERVER_PORT 4433
 #define SERVER_NAME "localhost"
diff --git a/programs/ssl/dtls_server.c b/programs/ssl/dtls_server.c
index 12b2731..4eabf98 100644
--- a/programs/ssl/dtls_server.c
+++ b/programs/ssl/dtls_server.c
@@ -70,6 +70,7 @@
 #include "mbedtls/net.h"
 #include "mbedtls/error.h"
 #include "mbedtls/debug.h"
+#include "mbedtls/timing.h"
 
 #if defined(MBEDTLS_SSL_CACHE_C)
 #include "mbedtls/ssl_cache.h"
diff --git a/programs/ssl/ssl_server2.c b/programs/ssl/ssl_server2.c
index 390450b..7982ae9 100644
--- a/programs/ssl/ssl_server2.c
+++ b/programs/ssl/ssl_server2.c
@@ -56,6 +56,7 @@
 #include "mbedtls/x509.h"
 #include "mbedtls/error.h"
 #include "mbedtls/debug.h"
+#include "mbedtls/timing.h"
 
 #include <stdio.h>
 #include <stdlib.h>