diff --git a/xs/src/libslic3r/Config.hpp b/xs/src/libslic3r/Config.hpp
index 7d76487c1f..e4968a24b7 100644
--- a/xs/src/libslic3r/Config.hpp
+++ b/xs/src/libslic3r/Config.hpp
@@ -998,7 +998,7 @@ protected:
 class UnknownOptionException : public std::exception
 {
 public:
-    const char* what() const _NOEXCEPT override { return "Unknown config option"; }
+    const char* what() const noexcept override { return "Unknown config option"; }
 };
 
 }