diff --git a/libs/ecs/include/psemek/ecs/detail/column.hpp b/libs/ecs/include/psemek/ecs/detail/column.hpp
index dfe5f514..3f240138 100644
--- a/libs/ecs/include/psemek/ecs/detail/column.hpp
+++ b/libs/ecs/include/psemek/ecs/detail/column.hpp
@@ -125,7 +125,7 @@ namespace psemek::ecs::detail
 		allocate(row_count_ + count);
 
 		auto src = reinterpret_cast<Component *>(data);
-		auto dst = reinterpret_cast<Component *>(data_);
+		auto dst = reinterpret_cast<Component *>(data_) + row_count_;
 		auto src_end = src + count;
 		while (src != src_end)
 		{
@@ -145,7 +145,7 @@ namespace psemek::ecs::detail
 			allocate(row_count_ + count);
 
 			auto src = reinterpret_cast<Component const *>(data);
-			auto dst = reinterpret_cast<Component *>(data_);
+			auto dst = reinterpret_cast<Component *>(data_) + row_count_;
 			auto src_end = src + count;
 			while (src != src_end)
 			{