diff --git a/MATLAB/+qc/get_pulse_duration.m b/MATLAB/+qc/get_pulse_duration.m
index f62cdcaaa..50aaaa154 100644
--- a/MATLAB/+qc/get_pulse_duration.m
+++ b/MATLAB/+qc/get_pulse_duration.m
@@ -2,7 +2,7 @@
 	% Return pulse length in s
 		
 	kwargs = cell2namevalpairs(fieldnames(parameters), struct2cell(parameters));
-	pulse_length = pulse_template.duration.evaluate_numeric(pyargs(kwargs{:}))*1e-9;
+	pulse_length = py.getattr(pulse_template, 'duration').evaluate_numeric(pyargs(kwargs{:}))*1e-9;
 	
 		
 function cellarr = cell2namevalpairs(field_names, values)