diff --git a/AppKit/CPCollectionView.j b/AppKit/CPCollectionView.j
index dbc631d8c..1f1123407 100644
--- a/AppKit/CPCollectionView.j
+++ b/AppKit/CPCollectionView.j
@@ -235,7 +235,7 @@ import <AppKit/CPView.j>
 */
 - (void)setAllowsMultipleSelection:(BOOL)shouldAllowMultipleSelection
 {
-    _allowsMultipleSelection = shouldAllowsMultipleSelection;
+    _allowsMultipleSelection = shouldAllowMultipleSelection;
 }
 
 /*
@@ -691,4 +691,4 @@ var CPCollectionViewItemViewKey = @"CPCollectionViewItemViewKey";
     [aCoder encodeObject:_view forKey:CPCollectionViewItemViewKey];
 }
 
-@end
+@end
\ No newline at end of file