diff --git a/changelog/change_make_token_left_curly_brace_aware_of_lambda_brace.md b/changelog/change_make_token_left_curly_brace_aware_of_lambda_brace.md
new file mode 100644
index 000000000..b6352a25e
--- /dev/null
+++ b/changelog/change_make_token_left_curly_brace_aware_of_lambda_brace.md
@@ -0,0 +1 @@
+* [#272](https://github.com/rubocop/rubocop-ast/pull/272): Make `Node#left_curly_brace?` aware of lambda brace. ([@koic][])
diff --git a/lib/rubocop/ast/token.rb b/lib/rubocop/ast/token.rb
index ccf9af928..f523681e4 100644
--- a/lib/rubocop/ast/token.rb
+++ b/lib/rubocop/ast/token.rb
@@ -83,7 +83,7 @@ def left_brace?
       end
 
       def left_curly_brace?
-        type == :tLCURLY
+        type == :tLCURLY || type == :tLAMBEG
       end
 
       def right_curly_brace?
diff --git a/spec/rubocop/ast/token_spec.rb b/spec/rubocop/ast/token_spec.rb
index 65d6866b0..7ca8e92a1 100644
--- a/spec/rubocop/ast/token_spec.rb
+++ b/spec/rubocop/ast/token_spec.rb
@@ -319,6 +319,7 @@ def foo
       let(:source) { <<~RUBY }
         { a: 1 }
         foo { |f| bar(f) }
+        -> { f }
       RUBY
 
       let(:left_hash_brace_token) do
@@ -331,6 +332,9 @@ def foo
       let(:left_block_brace_token) do
         processed_source.find_token { |t| t.text == '{' && t.line == 2 }
       end
+      let(:left_lambda_brace_token) do
+        processed_source.find_token { |t| t.text == '{' && t.line == 3 }
+      end
       let(:left_parens_token) do
         processed_source.find_token { |t| t.text == '(' }
       end
@@ -357,6 +361,7 @@ def foo
       describe '#left_curly_brace?' do
         it 'returns true for left block brace tokens' do
           expect(left_block_brace_token).to be_left_curly_brace
+          expect(left_lambda_brace_token).to be_left_curly_brace
         end
 
         # FIXME: `broken_on: :prism` can be removed when