diff --git a/library/ssl_tls13_generic.c b/library/ssl_tls13_generic.c
index 1bf627d..5d5b853 100644
--- a/library/ssl_tls13_generic.c
+++ b/library/ssl_tls13_generic.c
@@ -37,7 +37,7 @@
 #include "ssl_debug_helpers.h"
 
 #include "psa/crypto.h"
-#include "mbedtls/psa_util.h"
+#include "psa_util_internal.h"
 
 #if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_EPHEMERAL_ENABLED) || \
     defined(PSA_WANT_ALG_ECDH) || defined(PSA_WANT_ALG_FFDH)