diff --git a/bundles/org.openhab.binding.knx/src/main/resources/OH-INF/thing/serial.xml b/bundles/org.openhab.binding.knx/src/main/resources/OH-INF/thing/serial.xml
index f01503e41..4357d0ef9 100644
--- a/bundles/org.openhab.binding.knx/src/main/resources/OH-INF/thing/serial.xml
+++ b/bundles/org.openhab.binding.knx/src/main/resources/OH-INF/thing/serial.xml
@@ -10,6 +10,7 @@
 		<config-description>
 			<parameter name="serialPort" type="text" required="true">
 				<context>serial-port </context>
+				<limitToOptions>false</limitToOptions>
 				<label>Serial Port</label>
 				<description>The serial port to use for connecting to the KNX bus</description>
 			</parameter>