diff --git a/middleman-core/features/builder.feature b/middleman-core/features/builder.feature
index 92e4310d..b61f5cdc 100644
--- a/middleman-core/features/builder.feature
+++ b/middleman-core/features/builder.feature
@@ -46,4 +46,12 @@ Feature: Builder
   Scenario: Build alias (b)
     Given a fixture app "large-build-app"
     When I run `middleman b`
-    Then was successfully built
\ No newline at end of file
+    Then was successfully built
+
+  Scenario: Builded text file(ex: html, css, xml, txt)'s permission is 0644
+    Given a successfully built app at "large-build-app"
+    When I cd to "build"
+    Then the mode of filesystem object "index.html" should match "0644"
+    And the mode of filesystem object "stylesheets/static.css" should match "0644"
+    And the mode of filesystem object "feed.xml" should match "0644"
+    And the mode of filesystem object ".htaccess" should match "0644"
diff --git a/middleman-core/lib/middleman-core/builder.rb b/middleman-core/lib/middleman-core/builder.rb
index da2bea06..0d0966c4 100644
--- a/middleman-core/lib/middleman-core/builder.rb
+++ b/middleman-core/lib/middleman-core/builder.rb
@@ -130,6 +130,7 @@ module Middleman
       file.binmode
       file.write(contents)
       file.close
+      File.chmod(0644, file)
       file
     end