diff --git a/control/rlocus.py b/control/rlocus.py
index 53c5c9031..60565d48d 100644
--- a/control/rlocus.py
+++ b/control/rlocus.py
@@ -260,7 +260,7 @@ def root_locus(sys, kvect=None, xlim=None, ylim=None,
if isdtime(sys, strict=True):
zgrid(ax=ax)
else:
- _sgrid_func(fig=fig if sisotool else None)
+ _sgrid_func(ax)
else:
ax.axhline(0., linestyle=':', color='k', linewidth=.75, zorder=-20)
ax.axvline(0., linestyle=':', color='k', linewidth=.75, zorder=-20)
@@ -660,13 +660,7 @@ def _removeLine(label, ax):
del line
-def _sgrid_func(fig=None, zeta=None, wn=None):
- if fig is None:
- fig = plt.gcf()
- ax = fig.gca()
- else:
- ax = fig.axes[1]
-
+def _sgrid_func(ax, zeta=None, wn=None):
# Get locator function for x-axis, y-axis tick marks
xlocator = ax.get_xaxis().get_major_locator()
ylocator = ax.get_yaxis().get_major_locator()
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