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-rw-r--r--ext/nkf/lib/kconv.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/nkf/lib/kconv.rb b/ext/nkf/lib/kconv.rb
index a1c62e7765..159a5aa233 100644
--- a/ext/nkf/lib/kconv.rb
+++ b/ext/nkf/lib/kconv.rb
@@ -181,7 +181,7 @@ module Kconv
)*
\x1b \x28 B [\t\n\r\x20-\x7E]*
)*
- \z/nox =~ str.dup.force_encoding(nil) ? true : false
+ \z/nox =~ str.dup.force_encoding('BINARY') ? true : false
end
module_function :isjis