diff --git a/AppKit/CPArrayController.j b/AppKit/CPArrayController.j
index 724a2edee..68949bcd6 100644
--- a/AppKit/CPArrayController.j
+++ b/AppKit/CPArrayController.j
@@ -345,6 +345,15 @@
     [self __setSelectionIndexes:indexes];
 }
 
+/*
+    Like setSelectionIndex but don't fire any change notifications.
+    @ignore
+*/
+- (BOOL)__setSelectionIndex:(int)theIndex
+{
+    [self __setSelectionIndexes:[CPIndexSet indexSetWithIndex:theIndex]];
+}
+
 /*
     Like setSelectionIndexes but don't fire any change notifications.
     @ignore