diff --git a/.rufo b/.rufo
index 5faeea24..35d1e354 100644
--- a/.rufo
+++ b/.rufo
@@ -1,4 +1,3 @@
-indent_size                 2
 spaces_inside_hash_brace    :never
 spaces_around_binary        :one
 parens_in_def               :yes
diff --git a/lib/rufo/formatter.rb b/lib/rufo/formatter.rb
index 08a6ac4a..646844e5 100644
--- a/lib/rufo/formatter.rb
+++ b/lib/rufo/formatter.rb
@@ -3,6 +3,8 @@
 require "ripper"
 
 class Rufo::Formatter
+  INDENT_SIZE = 2
+
   def self.format(code, **options)
     formatter = new(code, **options)
     formatter.format
@@ -1222,7 +1224,7 @@ def visit_command_args(args, base_column)
       #
       #     foo 1,
       #         2
-    elsif !args_is_def_class_or_module && @first_token_in_line && base_column + @indent_size == @first_token_in_line[0][1]
+    elsif !args_is_def_class_or_module && @first_token_in_line && base_column + INDENT_SIZE == @first_token_in_line[0][1]
       # Otherwise, align it just by two spaces (so we need to dedent, we fake a dedent here)
       #
       #     foo 1,
@@ -1503,7 +1505,7 @@ def visit_bodystmt(node)
     end
 
     if inside_type_body && current_type && @visibility_indent_in_action[current_type]
-      @indent -= @indent_size
+      @indent -= INDENT_SIZE
       @visibility_indent_in_action.delete current_type
     end
 
@@ -2685,7 +2687,7 @@ def visit_literal_elements(elements, inside_hash: false, inside_array: false, to
       # foo([
       #       2,
       #     ])
-      @literal_indents << [base_line, @line, token_column + @indent_size - needed_indent]
+      @literal_indents << [base_line, @line, token_column + INDENT_SIZE - needed_indent]
     elsif call_info && call_info[0] == current_token_column
       # If the closing literal position matches the column where
       # the call started, we want to preserve it like that
@@ -3260,9 +3262,9 @@ def indent(value = nil)
       yield
       @indent = old_indent
     else
-      @indent += @indent_size
+      @indent += INDENT_SIZE
       yield
-      @indent -= @indent_size
+      @indent -= INDENT_SIZE
     end
   end
 
@@ -3438,7 +3440,7 @@ def indent_after_space(node, sticky: false, want_space: true, first_space: nil,
   end
 
   def next_indent
-    @indent + @indent_size
+    @indent + INDENT_SIZE
   end
 
   def check(kind)
@@ -3534,8 +3536,8 @@ def adjust_visibility_indent(node, base_column)
       if last_newline_index
         # Remove extra indent if we are indenting inside private/protected/public
         # and we just found another one.
-        @output = "#{@output[0..last_newline_index]}#{@output[last_newline_index + 1 + @indent_size..-1]}".dup
-        @indent -= @indent_size
+        @output = "#{@output[0..last_newline_index]}#{@output[last_newline_index + 1 + INDENT_SIZE..-1]}".dup
+        @indent -= INDENT_SIZE
         @visibility_indent_in_action.delete @current_type
       end
     end
@@ -3554,8 +3556,8 @@ def adjust_visibility_indent(node, base_column)
 
     return if i < 0
 
-    if @visibility_indent == :indent || base_column + @indent_size == @tokens[i][0][1]
-      @indent += @indent_size
+    if @visibility_indent == :indent || base_column + INDENT_SIZE == @tokens[i][0][1]
+      @indent += INDENT_SIZE
       @visibility_indent_in_action[@current_type] = true
     end
   end
diff --git a/lib/rufo/formatter/settings.rb b/lib/rufo/formatter/settings.rb
index 6103bc3f..9a463db6 100644
--- a/lib/rufo/formatter/settings.rb
+++ b/lib/rufo/formatter/settings.rb
@@ -1,6 +1,5 @@
 class Rufo::Formatter
   def init_settings(options)
-    indent_size options.fetch(:indent_size, 2)
     spaces_inside_hash_brace options.fetch(:spaces_inside_hash_brace, :dynamic)
     spaces_around_binary options.fetch(:spaces_around_binary, :dynamic)
     parens_in_def options.fetch(:parens_in_def, :dynamic)
@@ -11,10 +10,6 @@ def init_settings(options)
     trailing_commas options.fetch(:trailing_commas, :dynamic)
   end
 
-  def indent_size(value)
-    @indent_size = value
-  end
-
   def spaces_inside_hash_brace(value)
     @spaces_inside_hash_brace = dynamic_always_never_match("spaces_inside_hash_brace", value)
   end
diff --git a/spec/lib/rufo/formatter_source_specs/indent_size.rb.spec b/spec/lib/rufo/formatter_source_specs/indent_size.rb.spec
deleted file mode 100644
index b9b83783..00000000
--- a/spec/lib/rufo/formatter_source_specs/indent_size.rb.spec
+++ /dev/null
@@ -1,13 +0,0 @@
-#~# ORIGINAL
-#~# indent_size: 4
-
-begin 
- 1 
- end
-
-#~# EXPECTED
-
-begin
-    1
-end
-