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-rw-r--r--lib/clogger/pure.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/clogger/pure.rb b/lib/clogger/pure.rb
index 0a7aa24..ebbb1d6 100644
--- a/lib/clogger/pure.rb
+++ b/lib/clogger/pure.rb
@@ -62,7 +62,7 @@ private
   def byte_xs(s)
     s = s.dup
     s.force_encoding(Encoding::BINARY) if defined?(Encoding::BINARY)
-    s.gsub!(/(['"\x00-\x1f])/) { |x| "\\x#{$1.unpack('H2').first}" }
+    s.gsub!(/(['"\x00-\x1f])/) { |x| "\\x#{$1.unpack('H2').first.upcase}" }
     s
   end