diff --git a/which.spec b/which.spec
index 4424768..474b530 100644
--- a/which.spec
+++ b/which.spec
@@ -1,7 +1,7 @@
 Summary: Displays where a particular program in your path is located
 Name: which
 Version: 2.21
-Release: 29%{?dist}
+Release: 30%{?dist}
 License: GPLv3
 Source0: http://ftp.gnu.org/gnu/which/%{name}-%{version}.tar.gz
 Source1: which2.sh
@@ -41,6 +41,9 @@ rm -f $RPM_BUILD_ROOT%{_infodir}/dir
 %{_mandir}/man1/which.1*
 
 %changelog
+* Tue Oct 26 2021 Than Ngo <than@redhat.com> - 2.21-30
+- disable the --read-functions option in korn shells
+
 * Fri Oct 15 2021 Than Ngo <than@redhat.com> - 2.21-29
 - Fixed regression, use export instead alias
 
diff --git a/which2.sh b/which2.sh
index 610a415..ae2a254 100644
--- a/which2.sh
+++ b/which2.sh
@@ -3,7 +3,7 @@
 
 case "$(cat /proc/$$/comm)" in
 ksh|mksh)
-    which_declare="typeset -fS"
+    which_declare=""
     which_opt=""
     ;;
 zsh)
@@ -17,7 +17,7 @@ zsh)
 esac
 
 which () {
-  (alias; eval ${which_declare}) | /usr/bin/which --tty-only --read-alias --read-functions --show-tilde --show-dot $@
+    (alias; eval ${which_declare}) | /usr/bin/which --tty-only --read-alias --read-functions --show-tilde --show-dot $@
 }
 
 export which_declare