diff --git a/spec/rubocop/ast/processed_source_spec.rb b/spec/rubocop/ast/processed_source_spec.rb
index d8290dc09..deb2912ad 100644
--- a/spec/rubocop/ast/processed_source_spec.rb
+++ b/spec/rubocop/ast/processed_source_spec.rb
@@ -382,8 +382,7 @@ def some_method
 
   describe '#blank?' do
     context 'with source of no content' do
-      let(:source) { <<~RUBY }
-      RUBY
+      let(:source) { '' }
 
       it 'returns true' do
         expect(processed_source).to be_blank
@@ -403,8 +402,7 @@ def some_method
 
   describe '#start_with?' do
     context 'with blank source' do
-      let(:source) { <<~RUBY }
-      RUBY
+      let(:source) { '' }
 
       it 'returns false' do
         expect(processed_source).not_to be_start_with('start')