diff --git a/scripts/calibrate_shaper.py b/scripts/calibrate_shaper.py
index 74e34c94..bd2d4308 100755
--- a/scripts/calibrate_shaper.py
+++ b/scripts/calibrate_shaper.py
@@ -88,9 +88,7 @@ def plot_freq_response(lognames, calibration_data, shapers,
 
     title = "Frequency response and shapers (%s)" % (', '.join(lognames))
     ax.set_title("\n".join(wrap(title, MAX_TITLE_LENGTH)))
-    ax.xaxis.set_minor_locator(matplotlib.ticker.AutoMinorLocator())
-    ax.yaxis.set_minor_locator(matplotlib.ticker.AutoMinorLocator())
-    ax.xaxis.set_minor_locator(matplotlib.ticker.AutoMinorLocator())
+    ax.xaxis.set_minor_locator(matplotlib.ticker.MultipleLocator(5))
     ax.yaxis.set_minor_locator(matplotlib.ticker.AutoMinorLocator())
     ax.ticklabel_format(axis='y', style='scientific', scilimits=(0,0))
     ax.grid(which='major', color='grey')