diff --git a/lib/statesman/callback.rb b/lib/statesman/callback.rb
index 9c0623ea..5d9f76c1 100644
--- a/lib/statesman/callback.rb
+++ b/lib/statesman/callback.rb
@@ -40,11 +40,11 @@ def matches_all_transitions
     end
 
     def matches_from_state(from, to)
-      (from == self.from && (to.nil? || self.to.empty?))
+      from == self.from && (to.nil? || self.to.empty?)
     end
 
     def matches_to_state(from, to)
-      ((from.nil? || self.from.nil?) && self.to.include?(to))
+      (from.nil? || self.from.nil?) && self.to.include?(to)
     end
 
     def matches_both_states(from, to)