diff --git a/which.spec b/which.spec
index b644114..4424768 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: 28%{?dist}
+Release: 29%{?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
+* Fri Oct 15 2021 Than Ngo <than@redhat.com> - 2.21-29
+- Fixed regression, use export instead alias
+
 * Sun Oct 10 2021 Than Ngo <than@redhat.com> - 2.21-28
 - Resolves: #2009547, which treats function contents as aliases when parsing ksh
 
diff --git a/which2.sh b/which2.sh
index 2a108e6..610a415 100644
--- a/which2.sh
+++ b/which2.sh
@@ -1,18 +1,24 @@
 # shellcheck shell=sh
 # Initialization script for bash, sh, mksh and ksh
 
-which_shell="$(cat /proc/$$/comm)"
+case "$(cat /proc/$$/comm)" in
+ksh|mksh)
+    which_declare="typeset -fS"
+    which_opt=""
+    ;;
+zsh)
+    which_declare="typeset -f"
+    which_opt=""
+    ;;
+*)
+    which_declare="declare -f"
+    which_opt="-f"
+    ;;
+esac
 
-if [ "$which_shell" = "ksh" ] || [ "$which_shell" = "mksh" ] || [ "$which_shell" = "zsh" ] ; then
-  alias which_declare="typeset -fS"
-  which_opt=""
-else
-  which_opt="-f"
-  alias which_declare="declare -f"
-fi
- 
 which () {
-  (alias; 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
 export ${which_opt} which