diff --git a/tasmota/tasmota_configurations.h b/tasmota/tasmota_configurations.h
index f0d71750e..e00ed0c22 100644
--- a/tasmota/tasmota_configurations.h
+++ b/tasmota/tasmota_configurations.h
@@ -754,6 +754,7 @@
 #undef USE_THERMOSTAT                            // Disable support for Thermostat
 #undef DEBUG_THEO                                // Disable debug code
 #undef USE_DEBUG_DRIVER                          // Disable debug code
+#undef USE_AC_ZERO_CROSS_DIMMER                  // Disable support for AC_ZERO_CROSS_DIMMER
 #endif  // FIRMWARE_LITE