diff --git a/pyNN/neuron/cells.py b/pyNN/neuron/cells.py
index cc2d55ed5..d5ab53e43 100644
--- a/pyNN/neuron/cells.py
+++ b/pyNN/neuron/cells.py
@@ -607,5 +607,7 @@ def clear_past_spikes(self):
         end = self._spike_times.indwhere(">", h.t)
         if end > 0:
             self._spike_times.remove(0, end - 1)  # range is inclusive
-
-    
+        else:
+            self._spike_times.resize(0)
+        # Vector is resized -> restart VecStim.play() to fix indexing
+        self.play(self._spike_times)