diff --git a/bin/pyenv-virtualenv-init b/bin/pyenv-virtualenv-init
index c2ef1cd..90fe9fe 100755
--- a/bin/pyenv-virtualenv-init
+++ b/bin/pyenv-virtualenv-init
@@ -144,7 +144,7 @@ EOS
     ;;
   zsh )
     cat <<EOS
-typeset -a precmd_functions
+typeset -g -a precmd_functions
 if [[ -z \$precmd_functions[(r)_pyenv_virtualenv_hook] ]]; then
   precmd_functions+=_pyenv_virtualenv_hook;
 fi
diff --git a/test/init.bats b/test/init.bats
index 0f1be0c..3ad746c 100644
--- a/test/init.bats
+++ b/test/init.bats
@@ -113,7 +113,7 @@ _pyenv_virtualenv_hook() {
     fi
   fi
 };
-typeset -a precmd_functions
+typeset -g -a precmd_functions
 if [[ -z \$precmd_functions[(r)_pyenv_virtualenv_hook] ]]; then
   precmd_functions+=_pyenv_virtualenv_hook;
 fi