diff --git a/libs/geom/include/psemek/geom/simplex.hpp b/libs/geom/include/psemek/geom/simplex.hpp
index 8716c95b..03d9721d 100644
--- a/libs/geom/include/psemek/geom/simplex.hpp
+++ b/libs/geom/include/psemek/geom/simplex.hpp
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <psemek/geom/point.hpp>
+#include <psemek/util/hash.hpp>
 
 #include <iostream>
 #include <type_traits>
@@ -131,3 +132,21 @@ namespace psemek::geom
 	}
 
 }
+
+namespace std
+{
+
+	template <typename Point, std::size_t K>
+	struct hash<::psemek::geom::simplex<Point, K>>
+	{
+		std::size_t operator()(::psemek::geom::simplex<Point, K> const & simplex) const
+		{
+			std::size_t result = 0;
+			std::hash<Point> h;
+			for (auto const & p : simplex.points)
+				::psemek::util::hash_combine(result, h(p));
+			return result;
+		}
+	};
+
+}