diff --git a/lib/irb/color.rb b/lib/irb/color.rb
index aa4c60aa12..b53cc75035 100644
--- a/lib/irb/color.rb
+++ b/lib/irb/color.rb
@@ -66,9 +66,11 @@ module IRB # :nodoc:
 
     class Lexer < Ripper::Lexer
       if method_defined?(:token)
-        def on_parse_error(mesg)
+        def on_error(mesg)
           @buf.push Elem.new([lineno(), column()], __callee__, token(), state())
         end
+        alias on_parse_error on_error
+        alias compile_error on_error
       end
     end
 
diff --git a/parse.y b/parse.y
index 091efa9f59..c8930d8792 100644
--- a/parse.y
+++ b/parse.y
@@ -9232,6 +9232,7 @@ parser_yylex(struct parser_params *p)
       default:
 	if (!parser_is_identchar(p)) {
 	    compile_error(p, "Invalid char `\\x%02X' in expression", c);
+            token_flush(p);
 	    goto retry;
 	}
 
diff --git a/test/ripper/test_scanner_events.rb b/test/ripper/test_scanner_events.rb
index 727e967d67..0b4814a73e 100644
--- a/test/ripper/test_scanner_events.rb
+++ b/test/ripper/test_scanner_events.rb
@@ -24,9 +24,11 @@ class TestRipper::ScannerEvents < Test::Unit::TestCase
     lexer = Ripper::Lexer.new(str)
     if error
       lexer.singleton_class.class_eval do
-        define_method(:on_parse_error) {|ev|
+        define_method(:on_error) {|ev|
           yield __callee__, ev, token()
         }
+        alias on_parse_error on_error
+        alias compile_error on_error
       end
     end
     lexer.lex.select {|_1,type,_2| type == sym }.map {|_1,_2,tok| tok }
@@ -967,4 +969,11 @@ class TestRipper::ScannerEvents < Test::Unit::TestCase
                  scan('tlambda_arg', '-> {}')
   end
 
+  def test_invalid_char
+    err = nil
+    assert_equal ['a'], scan('ident', "\ea") {|*e| err = e}
+    assert_equal :compile_error, err[0]
+    assert_match /Invalid char/, err[1]
+    assert_equal "\e", err[2]
+  end
 end if ripper_test