diff --git a/scripts/ztplot.py b/scripts/ztplot.py
index efa3a5dea2793f3d9349f892d496b0c6dca533b8..a00808de407be617501a7e4444e199ddbdd5341b 100755
--- a/scripts/ztplot.py
+++ b/scripts/ztplot.py
@@ -165,12 +165,12 @@ class ZTPlot(kp.Module):
         f = os.path.join(self.plots_path, filename + '.png')
         f_tmp = os.path.join(self.plots_path, filename + '_tmp.png')
 
-        fig = ztplot(hits,
-                     filename=f_tmp,
-                     title=title,
-                     max_z=self.max_z,
-                     ytick_distance=self.ytick_distance,
-                     grid_lines=grid_lines)
+        ztplot(hits,
+               filename=f_tmp,
+               title=title,
+               max_z=self.max_z,
+               ytick_distance=self.ytick_distance,
+               grid_lines=grid_lines)
         shutil.move(f_tmp, f)
 
         if overlays > self.records['overlays'] or n_hits > self.records[