diff --git a/src/bm.h b/src/bm.h
index 547b108..0c59785 100644
--- a/src/bm.h
+++ b/src/bm.h
@@ -523,7 +523,7 @@ public:
         {
             bvect_ = ii.bvect_;
             if (!buf_)
-                buf_ = bvect_->allocate_tempblock();
+                buf_ = (value_type*) bvect_->blockman_.get_allocator().alloc_bit_block();
             buf_size_ = ii.buf_size_;
             ::memcpy(buf_, ii.buf_, buf_size_ * sizeof(*buf_));
             sorted_ = ii.sorted_;
@@ -534,7 +534,7 @@ public:
         {
             bvect_ = ii.bvect_;
             if (buf_)
-                bvect_->free_tempblock(buf_);
+                bvect_->blockman_.get_allocator().free_bit_block((bm::word_t*)buf_);
             buf_ = ii.buf_; ii.buf_ = 0;
             buf_size_ = ii.buf_size_;
             sorted_ = ii.sorted_;