diff --git a/pyerrors/correlators.py b/pyerrors/correlators.py
index e074f95c..6759a49c 100644
--- a/pyerrors/correlators.py
+++ b/pyerrors/correlators.py
@@ -522,7 +522,7 @@ class Corr:
         if self.N != 1:
             raise Exception("Correlator must be projected before plotting")
         if x_range is None:
-            x_range = [0, self.T]
+            x_range = [0, self.T - 1]
 
         fig = plt.figure()
         ax1 = fig.add_subplot(111)