diff --git a/ChangeLog b/ChangeLog
index 8faa7ff363..a20f8429fa 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Apr 25 13:11:49 2014  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* configure.in: NetBSD's ksh, used by configure, needs escapes.
+
 Fri Apr 25 12:51:08 2014  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* configure.in: correct pthread_setname_np's prototype on NetBSD.
diff --git a/configure.in b/configure.in
index 93c01631ad..23dd321df0 100644
--- a/configure.in
+++ b/configure.in
@@ -2203,7 +2203,7 @@ if test x$setjmp_prefix = xsig; then
 else
     unset setjmp_sigmask
 fi
-AC_MSG_RESULT(${setjmp_prefix}setjmp${setjmp_suffix}${setjmp_cast:+($setjmp_cast)})
+AC_MSG_RESULT(${setjmp_prefix}setjmp${setjmp_suffix}${setjmp_cast:+\($setjmp_cast\)})
 AC_DEFINE_UNQUOTED([RUBY_SETJMP(env)], [${setjmp_prefix}setjmp${setjmp_suffix}($setjmp_cast(env)${setjmp_sigmask+,0})])
 AC_DEFINE_UNQUOTED([RUBY_LONGJMP(env,val)], [${setjmp_prefix}longjmp($setjmp_cast(env),val)])
 AC_DEFINE_UNQUOTED(RUBY_JMP_BUF, ${setjmp_sigmask+${setjmp_prefix}}jmp_buf)