diff --git a/library/ssl_tls13_generic.c b/library/ssl_tls13_generic.c
index 3be6db7..529cbb9 100644
--- a/library/ssl_tls13_generic.c
+++ b/library/ssl_tls13_generic.c
@@ -1484,9 +1484,12 @@
          ssl->total_early_data_size)) {
 
         MBEDTLS_SSL_DEBUG_MSG(
-            2, ("EarlyData: Too much early data received, %u + %" MBEDTLS_PRINTF_SIZET " > %u",
-                ssl->total_early_data_size, early_data_len,
-                ssl->session_negotiate->max_early_data_size));
+            2, ("EarlyData: Too much early data received, "
+                "%" MBEDTLS_PRINTF_SIZET " + %" MBEDTLS_PRINTF_SIZET
+                " > %" MBEDTLS_PRINTF_SIZET,
+                (size_t) ssl->total_early_data_size,
+                early_data_len,
+                (size_t) ssl->session_negotiate->max_early_data_size));
 
         MBEDTLS_SSL_PEND_FATAL_ALERT(
             MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE,