diff --git a/Triangulation_3/test/Triangulation_3/cdt_3_from_off.cpp b/Triangulation_3/test/Triangulation_3/cdt_3_from_off.cpp
index 2989c97d4e6..0358818c018 100644
--- a/Triangulation_3/test/Triangulation_3/cdt_3_from_off.cpp
+++ b/Triangulation_3/test/Triangulation_3/cdt_3_from_off.cpp
@@ -25,7 +25,11 @@
 #include <fstream>
 #include <string>
 #include <string_view>
+
+#if __cpp_lib_concepts >= 201806L && __cpp_lib_ranges >= 201911L
 #include <ranges>
+#endif
+
 #include <optional>
 #include <chrono>