diff --git a/util/sparse_set.h b/util/sparse_set.h
index efb9919..3cece2e 100644
--- a/util/sparse_set.h
+++ b/util/sparse_set.h
@@ -200,13 +200,12 @@
       std::copy_n(sparse_.data(), old_max_size, a.data());
     }
 
-    sparse_ = std::move(a);
-
     PODArray<int> b(max_size);
     if (dense_.data() != NULL) {
       std::copy_n(dense_.data(), old_max_size, b.data());
     }
 
+    sparse_ = std::move(a);
     dense_ = std::move(b);
 
     MaybeInitializeMemory(old_max_size, max_size);