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-rw-r--r--examples/logger_mp_safe.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/examples/logger_mp_safe.rb b/examples/logger_mp_safe.rb
index 05ad3fa..f2c0500 100644
--- a/examples/logger_mp_safe.rb
+++ b/examples/logger_mp_safe.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
 # Multi-Processing-safe monkey patch for Logger
 #
 # This monkey patch fixes the case where "preload_app true" is used and