diff --git a/lib/jekyll/collection.rb b/lib/jekyll/collection.rb
index 5d6b2728..ea6a81b6 100644
--- a/lib/jekyll/collection.rb
+++ b/lib/jekyll/collection.rb
@@ -187,7 +187,7 @@ module Jekyll
     # Returns the URL template to render collection's documents at.
     def url_template
       metadata.fetch('permalink') do
-          Utils.add_permalink_suffix("/:collection/:path", site.permalink_style)
+        Utils.add_permalink_suffix("/:collection/:path", site.permalink_style)
       end
     end
 
diff --git a/lib/jekyll/document.rb b/lib/jekyll/document.rb
index 0d23ac88..7d7e6bb4 100644
--- a/lib/jekyll/document.rb
+++ b/lib/jekyll/document.rb
@@ -60,7 +60,7 @@ module Jekyll
       end
       Utils.deep_merge_hashes!(data, other)
       if data.key?('date') && !data['date'].is_a?(Time)
-         data['date'] = Utils.parse_date(data['date'].to_s, "Document '#{relative_path}' does not have a valid date in the YAML front matter.")
+        data['date'] = Utils.parse_date(data['date'].to_s, "Document '#{relative_path}' does not have a valid date in the YAML front matter.")
       end
       data
     end
diff --git a/lib/jekyll/filters.rb b/lib/jekyll/filters.rb
index be3efa62..734457cb 100644
--- a/lib/jekyll/filters.rb
+++ b/lib/jekyll/filters.rb
@@ -223,7 +223,7 @@ module Jekyll
     # Returns the filtered array of objects
     def sort(input, property = nil, nils = "first")
       if input.nil?
-          raise ArgumentError.new("Cannot sort a null object.")
+        raise ArgumentError.new("Cannot sort a null object.")
       end
       if property.nil?
         input.sort
diff --git a/lib/jekyll/tags/highlight.rb b/lib/jekyll/tags/highlight.rb
index 027865cd..5881fa58 100644
--- a/lib/jekyll/tags/highlight.rb
+++ b/lib/jekyll/tags/highlight.rb
@@ -21,7 +21,7 @@ module Jekyll
               key, value = opt.split('=')
               # If a quoted list, convert to array
               if value && value.include?("\"")
-                  value.delete!('"')
+                value.delete!('"')
                   value = value.split
               end
               @highlight_options[key.to_sym] = value || true
diff --git a/lib/jekyll/tags/include.rb b/lib/jekyll/tags/include.rb
index b92e5b85..847e6638 100644
--- a/lib/jekyll/tags/include.rb
+++ b/lib/jekyll/tags/include.rb
@@ -56,7 +56,7 @@ module Jekyll
 
       def validate_file_name(file)
         if file !~ /^[a-zA-Z0-9_\/\.-]+$/ || file =~ /\.\// || file =~ /\/\./
-            raise ArgumentError.new <<-eos
+          raise ArgumentError.new <<-eos
 Invalid syntax for include tag. File contains invalid characters or sequences:
 
   #{file}