diff --git a/AppKit/CoreAnimation/CAAnimation.j b/AppKit/CoreAnimation/CAAnimation.j
index 77c53745b..d22380bd5 100644
--- a/AppKit/CoreAnimation/CAAnimation.j
+++ b/AppKit/CoreAnimation/CAAnimation.j
@@ -61,7 +61,7 @@
     Returns \c YES
     @return \c YES
 */
-- (void)shouldArchiveValueForKey:(CPString)aKey
+- (BOOL)shouldArchiveValueForKey:(CPString)aKey
 {
     return YES;
 }
@@ -131,4 +131,4 @@
     [anObject addAnimation:self forKey:aKey];
 }
 
-@end
\ No newline at end of file
+@end