diff --git a/training/deepspeech_training/util/helpers.py b/training/deepspeech_training/util/helpers.py
index 8d35e149..195c117e 100644
--- a/training/deepspeech_training/util/helpers.py
+++ b/training/deepspeech_training/util/helpers.py
@@ -103,11 +103,6 @@ class LimitingPool:
             self.processed -= 1
             yield obj
 
-    def imap_unordered(self, fun, it):
-        for obj in self.pool.imap_unordered(fun, self._limit(it)):
-            self.processed -= 1
-            yield obj
-
     def terminate(self):
         self.pool.terminate()