Index: src/org/jruby/RubyArray.java
===================================================================
--- src/org/jruby/RubyArray.java	(revision 4772)
+++ src/org/jruby/RubyArray.java	(working copy)
@@ -1319,7 +1319,9 @@
             if (!obj.respondsTo("to_ary")) {
                 return getRuntime().getFalse();
             } else {
-                return equalInternal(getRuntime().getCurrentContext(), obj, this);
+                return equalInternal(getRuntime().getCurrentContext(), 
+                        obj.callMethod(getRuntime().getCurrentContext(), "to_ary"), 
+                        this);
             }
         }