diff --git a/bindings/ruby/lib/whisper/parakeet.rb b/bindings/ruby/lib/whisper/parakeet.rb
index e856ad2bb..df9ac9274 100644
--- a/bindings/ruby/lib/whisper/parakeet.rb
+++ b/bindings/ruby/lib/whisper/parakeet.rb
@@ -5,6 +5,8 @@ module Whisper
     extend Mutex_m
 
     class << self
+      private
+
       def start_log_callback_thread
         return if @log_callback_thread&.alive?