diff --git a/mrblib/compar.rb b/mrblib/compar.rb
index b39d619f4..2ac70ac6e 100644
--- a/mrblib/compar.rb
+++ b/mrblib/compar.rb
@@ -49,7 +49,7 @@ module Comparable
   # ISO 15.3.3.2.3
   def == other
     cmp = self <=> other
-    cmp == 0
+    cmp.equal?(0)
   end
 
   ##