diff --git a/control/pzmap.py b/control/pzmap.py
index ee91ec9b9..e6007ed63 100644
--- a/control/pzmap.py
+++ b/control/pzmap.py
@@ -79,8 +79,8 @@ def pzmap(sys, Plot=True, title='Pole Zero Map'):
if len(poles) > 0:
plt.scatter(real(poles), imag(poles), s=50, marker='x')
if len(zeros) > 0:
- plt.scatter(real(zeros), imag(zeros), s=50, marker='o',
- facecolors='none')
+ plt.scatter(real(zeros), imag(zeros), s=50, marker='o')
+
# Add axes
#Somewhat silly workaround
plt.axhline(y=0, color='black')
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