diff --git a/src/core/ddsc/tests/config_simple_udp.xml b/src/core/ddsc/tests/config_simple_udp.xml
index 9367f80..a0963d0 100644
--- a/src/core/ddsc/tests/config_simple_udp.xml
+++ b/src/core/ddsc/tests/config_simple_udp.xml
@@ -15,7 +15,7 @@
 <CycloneDDS xmlns="https://cdds.io/config">
   <!-- Simple config-file for testing whether a config-file can be picked up
        correctly. -->
-  <Domain id="3">
+  <Domain Id="3">
     <General>
       <NetworkInterfaceAddress>127.0.0.1</NetworkInterfaceAddress>
       <AllowMulticast>true</AllowMulticast>