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-rw-r--r--lib/jcode.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/jcode.rb b/lib/jcode.rb
index 6b123a839b..f486efd79c 100644
--- a/lib/jcode.rb
+++ b/lib/jcode.rb
@@ -77,7 +77,7 @@ class String
def succ!
reg = end_regexp
- if self =~ reg
+ if $KCODE != 'NONE' && self =~ reg
succ_table = SUCC[$KCODE[0,1].downcase]
last1 = self[-1].ord
last2 = self[-2].ord