diff --git a/lib/irb/completion.rb b/lib/irb/completion.rb
index 58328c2490..a8a73cce80 100644
--- a/lib/irb/completion.rb
+++ b/lib/irb/completion.rb
@@ -194,8 +194,6 @@ module IRB
           ":" + s.id2name.encode(Encoding.default_external)
         rescue EncodingError
           # ignore
-        rescue Encoding::InvalidByteSequenceError => e
-          raise "Invalid byte sequence #{s.id2name.bytes.inspect} #{e.inspect}"
         end
         candidates.grep(/^#{Regexp.quote(sym)}/)