diff --git a/spec/support/shared_examples/block_matcher.rb b/spec/support/shared_examples/block_matcher.rb
index 5dca7c742..c248d4d3d 100644
--- a/spec/support/shared_examples/block_matcher.rb
+++ b/spec/support/shared_examples/block_matcher.rb
@@ -34,8 +34,9 @@ def invalid_expectation
 
   it 'preserves the symmetric property of `==`' do
     expect(matcher).to eq(matcher)
-    expect(matcher).not_to eq(-> { valid_block })
-    expect(-> { valid_block }).not_to eq(matcher)
+    valid_block_proc = -> { valid_block }
+    expect(matcher).not_to eq(valid_block_proc)
+    expect(valid_block_proc).not_to eq(matcher)
   end
 
   # NOTE: The four examples below make use of `proc` due to its tolerance