diff --git a/NEWS b/NEWS
index 92715387cd..1390117375 100644
--- a/NEWS
+++ b/NEWS
@@ -416,6 +416,13 @@ with all sufficient information, see the ChangeLog file or Redmine
 
 === Stdlib compatibility issues (excluding feature bug fixes)
 
+* Logger
+
+  * Logger.new("| command") had been working to open a command
+    unintentionally. It was prohibitted, and now Logger#initialize
+    treats a String argument only as a filename, as its specification.
+    [Bug #14212]
+
 * Net::HTTP
 
   * Net::HTTP#start now passes :ENV to p_addr by default. [Bug #13351]
diff --git a/lib/logger.rb b/lib/logger.rb
index f572921db4..4ccc03b614 100644
--- a/lib/logger.rb
+++ b/lib/logger.rb
@@ -743,7 +743,7 @@ private
 
     def open_logfile(filename)
       begin
-        open(filename, (File::WRONLY | File::APPEND))
+        File.open(filename, (File::WRONLY | File::APPEND))
       rescue Errno::ENOENT
         create_logfile(filename)
       end
@@ -751,7 +751,7 @@ private
 
     def create_logfile(filename)
       begin
-        logdev = open(filename, (File::WRONLY | File::APPEND | File::CREAT | File::EXCL))
+        logdev = File.open(filename, (File::WRONLY | File::APPEND | File::CREAT | File::EXCL))
         logdev.flock(File::LOCK_EX)
         logdev.sync = true
         add_log_header(logdev)