diff --git a/library/debug.c b/library/debug.c
index ab8b3524d4cf..cc88437f4463 100644
--- a/library/debug.c
+++ b/library/debug.c
@@ -84,6 +84,10 @@ void mbedtls_debug_print_msg(const mbedtls_ssl_context *ssl, int level,
         str[ret]     = '\n';
         str[ret + 1] = '\0';
     }
+    else 
+    {
+        str[DEBUG_BUF_SIZE - 2] = '\n';
+    }
 
     debug_send_line(ssl, level, file, line, str);
 }