diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index b388156..970a043 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -1268,6 +1268,13 @@
     MBEDTLS_SSL_DEBUG_BUF( 4, "before encrypt: output payload",
                       ssl->out_msg, ssl->out_msglen );
 
+    if( ssl->out_msglen > MBEDTLS_SSL_MAX_CONTENT_LEN )
+    {
+        MBEDTLS_SSL_DEBUG_MSG( 1, ( "Record content too large, maximum %d",
+                                    MBEDTLS_SSL_MAX_CONTENT_LEN ) );
+        return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+    }
+
     /*
      * Add MAC before if needed
      */