diff --git a/bin/pyenv-virtualenv-init b/bin/pyenv-virtualenv-init
index 03feec7..a4f19b2 100755
--- a/bin/pyenv-virtualenv-init
+++ b/bin/pyenv-virtualenv-init
@@ -112,8 +112,10 @@ EOS
   ;;
 * )
   cat <<EOS
-export PATH="${PYENV_VIRTUALENV_ROOT:-${PYENV_VIRTUALENV_INSTALL_PREFIX}}/shims:\${PATH}";
-export PYENV_VIRTUALENV_INIT=1;
+if [[ ":$PATH:" != *"${PYENV_VIRTUALENV_ROOT:-${PYENV_VIRTUALENV_INSTALL_PREFIX}}/shims"* ]]; then
+  export PATH="${PYENV_VIRTUALENV_ROOT:-${PYENV_VIRTUALENV_INSTALL_PREFIX}}/shims:\${PATH}";
+  export PYENV_VIRTUALENV_INIT=1;
+fi
 EOS
   ;;
 esac
diff --git a/test/init.bats b/test/init.bats
index 11e3a1b..03adb63 100644
--- a/test/init.bats
+++ b/test/init.bats
@@ -46,8 +46,10 @@ load test_helper
   run pyenv-virtualenv-init - bash
   assert_success
   assert_output <<EOS
-export PATH="${TMP}/pyenv/plugins/pyenv-virtualenv/shims:\${PATH}";
-export PYENV_VIRTUALENV_INIT=1;
+if [[ ":$PATH:" != *"${TMP}/pyenv/plugins/pyenv-virtualenv/shims"* ]]; then
+  export PATH="${TMP}/pyenv/plugins/pyenv-virtualenv/shims:\${PATH}";
+  export PYENV_VIRTUALENV_INIT=1;
+fi
 _pyenv_virtualenv_hook() {
   local ret=\$?
   if [ "\${PYENV_VERSION-}" = "\${_PYENV_VH_VERSION-}" ] \\
@@ -156,8 +158,10 @@ EOS
   run pyenv-virtualenv-init - zsh
   assert_success
   assert_output <<EOS
-export PATH="${TMP}/pyenv/plugins/pyenv-virtualenv/shims:\${PATH}";
-export PYENV_VIRTUALENV_INIT=1;
+if [[ ":$PATH:" != *"${TMP}/pyenv/plugins/pyenv-virtualenv/shims"* ]]; then
+  export PATH="${TMP}/pyenv/plugins/pyenv-virtualenv/shims:\${PATH}";
+  export PYENV_VIRTUALENV_INIT=1;
+fi
 _pyenv_virtualenv_hook() {
   local ret=\$?
   if [ "\${PYENV_VERSION-}" = "\${_PYENV_VH_VERSION-}" ] \\