diff --git a/libs/util/include/psemek/util/spatial_array.hpp b/libs/util/include/psemek/util/spatial_array.hpp
index 1bec02b1..b15b2fd2 100644
--- a/libs/util/include/psemek/util/spatial_array.hpp
+++ b/libs/util/include/psemek/util/spatial_array.hpp
@@ -5,6 +5,7 @@
 #include <psemek/util/to_string.hpp>
 
 #include <stdexcept>
+#include <cstdint>
 
 namespace psemek::util
 {