diff --git a/modules/util/line_plot.py b/modules/util/line_plot.py
index eaaaa211e7bc571545b8cfdbe21df6384e4cf8a8..cdcdd5c84d9f901423dff446588c0200f01e16d6 100644
--- a/modules/util/line_plot.py
+++ b/modules/util/line_plot.py
@@ -7,7 +7,6 @@ barWidth = 0.10
 
 def do_plot(x_values, y_values, line_labels, colors, x_axis_label=None, y_axis_label=None, invert=False, flip=False):
     num_lines = len(y_values)
-    npts = len(x_values)
 
     for k in range(num_lines):
         if flip: