diff --git a/collector.rb b/collector.rb
index 394ecc8..659ccb4 100644
--- a/collector.rb
+++ b/collector.rb
@@ -66,6 +66,10 @@ def validate_const(namespaced_const_string)
 
 runner =
   Class.new(Parser::Runner) do
+    class << self
+      attr_accessor :_has_errors
+    end
+
     def runner_name
       "dudu"
     end
@@ -81,7 +85,9 @@ def show(collection)
       return if collection.empty?
       puts
       collection.each { |pair| puts pair.join("\t") }
+      self.class._has_errors = true
     end
   end
 
-runner.go(ARGV)
\ No newline at end of file
+runner.go(ARGV)
+exit 1 if runner._has_errors