diff --git a/data/pref.xml b/data/pref.xml
index fad78ac83..50f5f2fa1 100644
--- a/data/pref.xml
+++ b/data/pref.xml
@@ -59,7 +59,7 @@
     <enum id="SelectionMode">
       <value id="DEFAULT" value="0" />
       <value id="ADD" value="1" />
-!      <value id="SUBTRACT" value="2" />
+      <value id="SUBTRACT" value="2" />
     </enum>
     <enum id="PivotPosition">
       <value id="NORTHWEST" value="0" />