diff --git a/contributed_definitions/NXsnsevent.nxdl.xml b/contributed_definitions/NXsnsevent.nxdl.xml
index 822253b4f..65f699d09 100644
--- a/contributed_definitions/NXsnsevent.nxdl.xml
+++ b/contributed_definitions/NXsnsevent.nxdl.xml
@@ -3,7 +3,7 @@
 <!--
   # NXsnsevent: candidate NeXus definition for event data from Spallation Neutron Source (SNS) at ORNL.
 -->
-<definition type="group" name="NXsnsevent" category="base" extends="NXobject"
+<definition type="group" name="NXsnsevent" category="application" extends="NXobject"
   xmlns="http://definition.nexusformat.org/nxdl/3.1"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://definition.nexusformat.org/nxdl/3.1 ../nxdl.xsd"