diff --git a/lib/mutant/cli.rb b/lib/mutant/cli.rb
index 4cd89880..2f27cfe2 100644
--- a/lib/mutant/cli.rb
+++ b/lib/mutant/cli.rb
@@ -157,7 +157,8 @@ module Mutant
     def dispatch_matcher
       argument = current_argument
       consume(1)
-      @matchers << Classifier.build(argument)
+      matcher = Classifier.build(argument)
+      @matchers << matcher if matcher
     end
 
     # Process option argument