diff --git a/which.spec b/which.spec
index 676c9a0..a9c6df7 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: 25%{?dist}
+Release: 26%{?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 May 04 2021 Than Ngo <than@redhat.com> - 2.21-26
+- Resolves: #1942153, fixed unbound variable
+
 * Mon Apr 26 2021 Than Ngo <than@redhat.com> - 2.21-25
 - improved which2.sh
 
diff --git a/which2.sh b/which2.sh
index 16b930c..6ef7979 100644
--- a/which2.sh
+++ b/which2.sh
@@ -15,4 +15,5 @@ which ()
 (alias; eval ${which_declare}) | /usr/bin/which --tty-only --read-alias --read-functions --show-tilde --show-dot "$@"
 }
 
+export which_declare
 export ${which_opt} which