diff --git a/std/experimental/allocator/building_blocks/bitmapped_block.d b/std/experimental/allocator/building_blocks/bitmapped_block.d
index d3852f0ee04..553f4207606 100644
--- a/std/experimental/allocator/building_blocks/bitmapped_block.d
+++ b/std/experimental/allocator/building_blocks/bitmapped_block.d
@@ -228,7 +228,7 @@ struct BitmappedBlock(size_t theBlockSize, uint theAlignment = platformAlignment
         && hasMember!(ParentAllocator, "deallocate"))
     ~this()
     {
-        auto start = _control.rep.ptr, end = _payload.ptr + _payload.length;
+        void* start = _control.rep.ptr, end = _payload.ptr + _payload.length;
         parent.deallocate(start[0 .. end - start]);
     }