1 files changed, 5 insertions, 3 deletions
diff --git a/lib/logger/log_device.rb b/lib/logger/log_device.rb
index 96d77b7b6a..84277a2656 100644
--- a/lib/logger/log_device.rb
+++ b/lib/logger/log_device.rb
@@ -79,8 +79,10 @@ class Logger
     def set_dev(log)
       if log.respond_to?(:write) and log.respond_to?(:close)
         @dev = log
-        if log.respond_to?(:path)
-          @filename = log.path
+        if log.respond_to?(:path) and path = log.path
+          if File.exist?(path)
+            @filename = path
+          end
         end
       else
         @dev = open_logfile(log)
@@ -135,7 +137,7 @@ class Logger
       end
     end
 
-    if /mswin|mingw|cygwin/ =~ RUBY_PLATFORM
+    if /mswin|mingw|cygwin/ =~ RbConfig::CONFIG['host_os']
       def lock_shift_log
         yield
       end