diff --git a/simulations/11_pulsed_timing.py b/simulations/11_pulsed_timing.py
index 9da6cb4..7c31b82 100755
--- a/simulations/11_pulsed_timing.py
+++ b/simulations/11_pulsed_timing.py
@@ -111,7 +111,7 @@ def my_correlation(in1, template, lags=None):
     return corrs, (in1, template, lags)
 
 def trace_upsampler(trace, template_t, trace_t):
-    template_dt = template.t[1] - template.t[0]
+    template_dt = template_t[1] - template_t[0]
     trace_dt = trace_t[1] - trace_t[0]
 
     upsample_factor = trace_dt/template_dt