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-rw-r--r--ext/json/lib/json/pure/generator.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/json/lib/json/pure/generator.rb b/ext/json/lib/json/pure/generator.rb
index 91bdc0ff410..b44e42ac41e 100644
--- a/ext/json/lib/json/pure/generator.rb
+++ b/ext/json/lib/json/pure/generator.rb
@@ -52,7 +52,7 @@ module JSON
)/nx) { |c|
c.size == 1 and raise GeneratorError, "invalid utf8 byte: '#{c}'"
c = c.unpack("U*")[0]
- c > 0xFFFF ? ('\uD%03X\uD%03X' % [0x7C0+c/1024, 0xC00+c%1024]) : ('\u%04X'%c)
+ c > 0xFFFF ? ('\ud%03x\ud%03x' % [0x7C0+c/1024, 0xC00+c%1024]) : ('\u%04x'%c)
}
string
end