diff --git a/QGL/PulseSequencer.py b/QGL/PulseSequencer.py
index 9af2dfb5..1cf15896 100644
--- a/QGL/PulseSequencer.py
+++ b/QGL/PulseSequencer.py
@@ -202,7 +202,7 @@ def __mul__(self, rhs):
 
         # copy PulseBlock so we don't modify other references
         result = copy(self)
-
+        result.pulses = copy(self.pulses)
         for (k, v) in rhs.pulses.items():
             if k in result.pulses.keys():
                 raise NameError(