2 files changed, 2 insertions, 1 deletions
diff --git a/lib/logger.rb b/lib/logger.rb
index 4205380a6a..7d55f62f30 100644
--- a/lib/logger.rb
+++ b/lib/logger.rb
@@ -11,6 +11,7 @@
 # A simple system for logging messages.  See Logger for more documentation.
 
 require 'monitor'
+require 'rbconfig'
 
 require_relative 'logger/version'
 require_relative 'logger/formatter'
diff --git a/lib/logger/log_device.rb b/lib/logger/log_device.rb
index 96d77b7b6a..8683328a5e 100644
--- a/lib/logger/log_device.rb
+++ b/lib/logger/log_device.rb
@@ -135,7 +135,7 @@ class Logger
       end
     end
 
-    if /mswin|mingw|cygwin/ =~ RUBY_PLATFORM
+    if /mswin|mingw|cygwin/ =~ RbConfig::CONFIG['host_os']
       def lock_shift_log
         yield
       end