diff --git a/lib/syntax_tree/cli.rb b/lib/syntax_tree/cli.rb
index 2484a5b7..cad4fc35 100644
--- a/lib/syntax_tree/cli.rb
+++ b/lib/syntax_tree/cli.rb
@@ -246,7 +246,7 @@ def run(item)
       #{Color.bold("stree help")}
         Display this help message
 
-      #{Color.bold("stree lsp [--plugins=...]")}
+      #{Color.bold("stree lsp [--plugins=...] [--print-width=NUMBER]")}
         Run syntax tree in language server mode
 
       #{Color.bold("stree version")}
@@ -300,7 +300,7 @@ def run(argv)
           return 0
         when "lsp"
           require "syntax_tree/language_server"
-          LanguageServer.new.run
+          LanguageServer.new(print_width: print_width).run
           return 0
         when "version"
           puts SyntaxTree::VERSION
diff --git a/lib/syntax_tree/language_server.rb b/lib/syntax_tree/language_server.rb
index 2eb8228b..41b80af1 100644
--- a/lib/syntax_tree/language_server.rb
+++ b/lib/syntax_tree/language_server.rb
@@ -13,11 +13,16 @@ module SyntaxTree
   #     stree lsp
   #
   class LanguageServer
-    attr_reader :input, :output
+    attr_reader :input, :output, :print_width
 
-    def initialize(input: $stdin, output: $stdout)
+    def initialize(
+      input: $stdin,
+      output: $stdout,
+      print_width: DEFAULT_PRINT_WIDTH
+    )
       @input = input.binmode
       @output = output.binmode
+      @print_width = print_width
     end
 
     # rubocop:disable Layout/LineLength
@@ -93,7 +98,7 @@ def format(source)
             character: 0
           }
         },
-        newText: SyntaxTree.format(source)
+        newText: SyntaxTree.format(source, print_width)
       }
     end
 
diff --git a/test/language_server_test.rb b/test/language_server_test.rb
index fc26054d..31062e87 100644
--- a/test/language_server_test.rb
+++ b/test/language_server_test.rb
@@ -120,6 +120,26 @@ def test_formatting
       end
     end
 
+    def test_formatting_print_width
+      contents = "#{"a" * 40} + #{"b" * 40}\n"
+      messages = [
+        Initialize.new(1),
+        TextDocumentDidOpen.new("file:///path/to/file.rb", contents),
+        TextDocumentFormatting.new(2, "file:///path/to/file.rb"),
+        TextDocumentDidClose.new("file:///path/to/file.rb"),
+        Shutdown.new(3)
+      ]
+
+      case run_server(messages, print_width: 100)
+      in [
+           { id: 1, result: { capabilities: Hash } },
+           { id: 2, result: [{ newText: new_text }] },
+           { id: 3, result: {} }
+         ]
+        assert_equal(contents, new_text)
+      end
+    end
+
     def test_inlay_hint
       messages = [
         Initialize.new(1),
@@ -234,11 +254,15 @@ def read(content)
       end
     end
 
-    def run_server(messages)
+    def run_server(messages, print_width: DEFAULT_PRINT_WIDTH)
       input = StringIO.new(messages.map { |message| write(message) }.join)
       output = StringIO.new
 
-      LanguageServer.new(input: input, output: output).run
+      LanguageServer.new(
+        input: input,
+        output: output,
+        print_width: print_width
+      ).run
       read(output.tap(&:rewind))
     end
   end