diff --git a/source/mijin/memory/stack_allocator.hpp b/source/mijin/memory/stack_allocator.hpp
index c92bd2f..745e01a 100644
--- a/source/mijin/memory/stack_allocator.hpp
+++ b/source/mijin/memory/stack_allocator.hpp
@@ -326,6 +326,7 @@ public:
             // couldn't allocate the snapshot
             return {};
         }
+        ::new (snapshotData) StackAllocatorSnapshotData;
         StackAllocatorSnapshot snapshot;
         snapshot.data = snapshotData;
         if (firstChunk_ != prevFirst)
@@ -442,6 +443,7 @@ public:
         Chunk* snapshotChunk = findChunk(snapshot.data);
         MIJIN_ASSERT_FATAL(snapshotChunk != nullptr, "Snapshot not in chunks?");
         snapshotChunk->allocated -= calcSnapshotSize(snapshot->numChunks); // note: this might miss the alignment bytes of the snapshot, but that should be fine
+        snapshot.data->~StackAllocatorSnapshotData();
     }
 private:
     void initAndAddChunk(Chunk* newChunk) noexcept