diff --git a/src/3rdparty/optional/optional.hpp b/src/3rdparty/optional/optional.hpp
index e0bf7007e8..ba7895c924 100644
--- a/src/3rdparty/optional/optional.hpp
+++ b/src/3rdparty/optional/optional.hpp
@@ -13,7 +13,7 @@
 # include <utility>
 # include <type_traits>
 # include <initializer_list>
-# include <cassert>
+//# include <cassert>
 # include <functional>
 # include <string>
 # include <stdexcept>