diff --git a/logstash-core/lib/logstash/config/config_ast.rb b/logstash-core/lib/logstash/config/config_ast.rb
index 23b9f2403da..fc5702f1a0b 100644
--- a/logstash-core/lib/logstash/config/config_ast.rb
+++ b/logstash-core/lib/logstash/config/config_ast.rb
@@ -232,18 +232,18 @@ def compile_initializer
 
     def compile
       case plugin_type
-        when "input"
-          return "start_input(#{variable_name})"
-        when "filter"
-          return <<-CODE
-          events = #{variable_name}.multi_filter(events)
-          CODE
-        when "output"
-          return "targeted_outputs << #{variable_name}\n"
-        when "codec"
-          settings = attributes.recursive_select(Attribute).collect(&:compile).reject(&:empty?)
-          attributes_code = "LogStash::Util.hash_merge_many(#{settings.map { |c| "{ #{c} }" }.join(", ")})"
-          return "plugin(#{plugin_type.inspect}, #{plugin_name.inspect}, #{attributes_code})"
+      when "input"
+        return "start_input(#{variable_name})"
+      when "filter"
+        return <<-CODE
+        events = #{variable_name}.multi_filter(events)
+        CODE
+      when "output"
+        return "targeted_outputs << #{variable_name}\n"
+      when "codec"
+        settings = attributes.recursive_select(Attribute).collect(&:compile).reject(&:empty?)
+        attributes_code = "LogStash::Util.hash_merge_many(#{settings.map { |c| "{ #{c} }" }.join(", ")})"
+        return "plugin(#{plugin_type.inspect}, #{plugin_name.inspect}, #{attributes_code})"
       end
     end