diff --git a/include/svs/core/data/simple.h b/include/svs/core/data/simple.h
index df0a45c3..fc278687 100644
--- a/include/svs/core/data/simple.h
+++ b/include/svs/core/data/simple.h
@@ -32,6 +32,7 @@
 #include "svs/lib/uuid.h"
 
 // stdlib
+#include <memory>
 #include <span>
 #include <type_traits>
 
@@ -672,10 +673,10 @@ class SimpleData<T, Extent, Blocked<Alloc>> {
     /// Add a new data block to the end of the current collection of blocks.
     ///
     void add_block() {
-        blocks_.emplace_back(
+        blocks_.emplace_back(std::make_unique<array_type>(
             make_dims(blocksize().value(), lib::forward_extent<Extent>(dimensions())),
             allocator_.get_allocator()
-        );
+        ));
     }
 
     ///
@@ -727,12 +728,12 @@ class SimpleData<T, Extent, Blocked<Alloc>> {
 
     const_value_type get_datum(size_t i) const {
         auto [block_id, data_id] = resolve(i);
-        return getindex(blocks_, block_id).slice(data_id);
+        return getindex(blocks_, block_id)->slice(data_id);
     }
 
     value_type get_datum(size_t i) {
         auto [block_id, data_id] = resolve(i);
-        return getindex(blocks_, block_id).slice(data_id);
+        return getindex(blocks_, block_id)->slice(data_id);
     }
 
     void prefetch(size_t i) const { lib::prefetch(get_datum(i)); }
@@ -827,7 +828,7 @@ class SimpleData<T, Extent, Blocked<Alloc>> {
   private:
     // The blocksize in terms of number of vectors.
     lib::PowerOfTwo blocksize_;
-    std::vector<array_type> blocks_;
+    std::vector<std::unique_ptr<array_type>> blocks_;
     size_t dimensions_;
     size_t size_;
     Blocked<Alloc> allocator_;