diff --git a/iidm/iidm-tck/src/test/java/com/powsybl/iidm/network/tck/AbstractShuntCompensatorTest.java b/iidm/iidm-tck/src/test/java/com/powsybl/iidm/network/tck/AbstractShuntCompensatorTest.java
index aff0e682f31..9f2419c12ed 100644
--- a/iidm/iidm-tck/src/test/java/com/powsybl/iidm/network/tck/AbstractShuntCompensatorTest.java
+++ b/iidm/iidm-tck/src/test/java/com/powsybl/iidm/network/tck/AbstractShuntCompensatorTest.java
@@ -387,6 +387,14 @@ public void regulationTest() {
         } catch (ValidationException ignored) {
             // ignore
         }
+        try {
+            shuntCompensator.setVoltageRegulatorOn(false);
+            shuntCompensator.setTargetDeadband(Double.NaN);
+            shuntCompensator.setVoltageRegulatorOn(true);
+            fail();
+        } catch (ValidationException ignored) {
+            // ignore
+        }
         shuntCompensator.setTargetDeadband(5.0);
         assertEquals(5.0, shuntCompensator.getTargetDeadband(), 0.0);
     }