diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index 3a8dd21..29c139e 100644
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -243,6 +243,10 @@
 #define MBEDTLS_SSL_OUT_CONTENT_LEN MBEDTLS_SSL_MAX_CONTENT_LEN
 #endif
 
+#if !defined(MBEDTLS_SSL_DTLS_MAX_BUFFERING)
+#define MBEDTLS_SSL_DTLS_MAX_BUFFERING ( 2 * MBEDTLS_SSL_IN_CONTENT_LEN )
+#endif
+
 /* \} name SECTION: Module settings */
 
 /*