diff --git a/library/ssl_tls13_keys.c b/library/ssl_tls13_keys.c
index 533865d..540f854 100644
--- a/library/ssl_tls13_keys.c
+++ b/library/ssl_tls13_keys.c
@@ -34,6 +34,7 @@
 #include "ssl_tls13_invasive.h"
 
 #include "psa/crypto.h"
+#include "md_psa.h"
 
 #define PSA_TO_MBEDTLS_ERR(status) PSA_TO_MBEDTLS_ERR_LIST(status,   \
                                                            psa_to_ssl_errors,             \