diff --git a/eval_error.c b/eval_error.c
index 6132cbe8c8..17c0e865b9 100644
--- a/eval_error.c
+++ b/eval_error.c
@@ -144,8 +144,6 @@ print_errinfo(const VALUE eclass, const VALUE errat, const VALUE emesg, const VA
 	    write_warn(str, ": ");
 	}
 
-	if (highlight) write_warn(str, bold);
-
 	if (!NIL_P(emesg)) {
 	    einfo = RSTRING_PTR(emesg);
             elen = RSTRING_LEN(emesg);
diff --git a/test/ruby/test_exception.rb b/test/ruby/test_exception.rb
index c69d18b0c9..713a59df70 100644
--- a/test/ruby/test_exception.rb
+++ b/test/ruby/test_exception.rb
@@ -1407,6 +1407,9 @@ $stderr = $stdout; raise "\x82\xa0"') do |outs, errs, status|
 
     message = e.full_message(highlight: true)
     assert_match(/\e/, message)
+    assert_not_match(/(\e\[1)m\1/, message)
+    e2 = assert_raise(RuntimeError) {raise RuntimeError, "", bt}
+    assert_not_match(/(\e\[1)m\1/, e2.full_message(highlight: true))
 
     message = e.full_message
     if Exception.to_tty?