diff --git a/libs/util/include/psemek/util/spatial_array.hpp b/libs/util/include/psemek/util/spatial_array.hpp
index b15b2fd2..671aa19a 100644
--- a/libs/util/include/psemek/util/spatial_array.hpp
+++ b/libs/util/include/psemek/util/spatial_array.hpp
@@ -4,7 +4,6 @@
 #include <psemek/util/exception.hpp>
 #include <psemek/util/to_string.hpp>
 
-#include <stdexcept>
 #include <cstdint>
 
 namespace psemek::util
@@ -36,6 +35,7 @@ namespace psemek::util
 		void expand(Ix ... index);
 
 		void clear();
+		bool empty() const;
 
 		T * begin();
 		T * end();
@@ -200,6 +200,12 @@ namespace psemek::util
 		array_.clear();
 	}
 
+	template <typename T, std::size_t N, typename Index>
+	bool spatial_array<T, N, Index>::empty() const
+	{
+		return array_.empty();
+	}
+
 	template <typename T, std::size_t N, typename Index>
 	T * spatial_array<T, N, Index>::begin()
 	{