diff --git a/lib/celluloid/pmap.rb b/lib/celluloid/pmap.rb
index f314907..7b796d4 100644
--- a/lib/celluloid/pmap.rb
+++ b/lib/celluloid/pmap.rb
@@ -12,6 +12,8 @@ def pmap(size=Celluloid.cores, &block)
           pool = Pmap::ParallelMapWorker.pool(size: size)
           futures = map { |elem| pool.future :yielder, elem, &block }
           futures.map { |future| future.value }
+        ensure
+          pool.terminate
         end
 
       end