diff --git a/library/ssl_tls13_server.c b/library/ssl_tls13_server.c
index ba64c32..df2bd34 100644
--- a/library/ssl_tls13_server.c
+++ b/library/ssl_tls13_server.c
@@ -25,6 +25,7 @@
 #include "mbedtls/error.h"
 #include "mbedtls/platform.h"
 #include "mbedtls/constant_time.h"
+#include "mbedtls/oid.h"
 #include "md_psa.h"
 
 #include "ssl_misc.h"