diff --git a/pyopencl/mempool.py b/pyopencl/mempool.py
index 1139edab691e86fdf955fc68c86e266fbb9bb8e6..071bdb98ffba1b1fc6462530c6739847d84cf8ee 100644
--- a/pyopencl/mempool.py
+++ b/pyopencl/mempool.py
@@ -248,7 +248,6 @@ class MemoryPool(object):
         for bin_nr, bin_list in six.iteritems(self.bin_nr_to_bin):
             while bin_list:
                 self.allocator.free(bin_list.pop())
-                self.held_blocks -= 1
                 yield