diff --git a/control/freqplot.py b/control/freqplot.py
index 961f499b3..2f0bcea28 100644
--- a/control/freqplot.py
+++ b/control/freqplot.py
@@ -2468,6 +2468,14 @@ def _determine_omega_vector(syslist, omega_in, omega_limits, omega_num,
"""
omega_range_given = True
+ if omega_in is None:
+ for sys in syslist:
+ if isinstance(sys, FrequencyResponseData):
+ # FRD already has predetermined frequencies
+ if omega_in is not None and not np.all(omega_in == sys.omega):
+ raise ValueError("List of FrequencyResponseData systems can only have a single frequency range between them")
+ omega_in = sys.omega
+
if omega_in is None:
if omega_limits is None:
omega_range_given = False
diff --git a/control/tests/frd_test.py b/control/tests/frd_test.py
index 987121987..25ecc5e21 100644
--- a/control/tests/frd_test.py
+++ b/control/tests/frd_test.py
@@ -192,6 +192,8 @@ def testNyquist(self):
# plt.savefig('/dev/null', format='svg')
plt.figure(2)
freqplot.nyquist(f1, f1.omega)
+ plt.figure(3)
+ freqplot.nyquist(f1)
# plt.savefig('/dev/null', format='svg')
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