1 files changed, 4 insertions, 4 deletions
diff --git a/lib/logger/formatter.rb b/lib/logger/formatter.rb
index 6a135b6fab..c634dbf34d 100644
--- a/lib/logger/formatter.rb
+++ b/lib/logger/formatter.rb
@@ -3,7 +3,8 @@
 class Logger
   # Default formatter for log messages.
   class Formatter
-    Format = "%s, [%s#%d] %5s -- %s: %s\n"
+    Format = "%.1s, [%s #%d] %5s -- %s: %s\n"
+    DatetimeFormat = "%Y-%m-%dT%H:%M:%S.%6N"
 
     attr_accessor :datetime_format
 
@@ -12,14 +13,13 @@ class Logger
     end
 
     def call(severity, time, progname, msg)
-      Format % [severity[0..0], format_datetime(time), Process.pid, severity, progname,
-        msg2str(msg)]
+      sprintf(Format, severity, format_datetime(time), Process.pid, severity, progname, msg2str(msg))
     end
 
   private
 
     def format_datetime(time)
-      time.strftime(@datetime_format || "%Y-%m-%dT%H:%M:%S.%6N ")
+      time.strftime(@datetime_format || DatetimeFormat)
     end
 
     def msg2str(msg)