diff --git a/base_classes/NXdetector.nxdl.xml b/base_classes/NXdetector.nxdl.xml
index 0392a787f4..f33b6d699b 100644
--- a/base_classes/NXdetector.nxdl.xml
+++ b/base_classes/NXdetector.nxdl.xml
@@ -587,7 +587,7 @@
             <item value="event"/>
             <item value="histogrammed"/>
             <item value="decimated"/>
-            <item value="pulse_counting"/>
+            <item value="pulse counting"/>
         </enumeration>
     </field>
     <field name="angular_calibration_applied" type="NX_BOOLEAN">