diff --git a/libexec/pyenv b/libexec/pyenv
index 40c763d2..9a7154f4 100755
--- a/libexec/pyenv
+++ b/libexec/pyenv
@@ -76,27 +76,27 @@ export PYENV_DIR
 
 shopt -s nullglob
 
-PYENV_INSTALL_PATH="$(abs_dirname "$0")"
-PYENV_INSTALL_PATH="${PYENV_INSTALL_PATH%/*}"
+_PYENV_INSTALL_PREFIX="$(abs_dirname "$0")"
+_PYENV_INSTALL_PREFIX="${_PYENV_INSTALL_PREFIX%/*}"
 
-export PYENV_INSTALL_PATH
+export _PYENV_INSTALL_PREFIX
 
-for plugin_bin in "${PYENV_INSTALL_PATH}"/plugins/*/bin; do
+for plugin_bin in "${_PYENV_INSTALL_PREFIX}"/plugins/*/bin; do
   PATH="${plugin_bin}:${PATH}"
 done
 # PYENV_ROOT can be set to anything, so it may happen to be equal to the base path above,
 # resulting in duplicate PATH entries
-if [ "${PYENV_INSTALL_PATH}" != "$PYENV_ROOT" ]; then
+if [ "${_PYENV_INSTALL_PREFIX}" != "$PYENV_ROOT" ]; then
   for plugin_bin in "${PYENV_ROOT}"/plugins/*/bin; do
     PATH="${plugin_bin}:${PATH}"
   done
 fi
-export PATH="${PYENV_INSTALL_PATH}/libexec:${PATH}"
+export PATH="${_PYENV_INSTALL_PREFIX}/libexec:${PATH}"
 
 PYENV_HOOK_PATH="${PYENV_HOOK_PATH}:${PYENV_ROOT}/pyenv.d"
-if [ "${PYENV_INSTALL_PATH}" != "$PYENV_ROOT" ]; then
+if [ "${_PYENV_INSTALL_PREFIX}" != "$PYENV_ROOT" ]; then
   # Add pyenv's own `pyenv.d` unless pyenv was cloned to PYENV_ROOT
-  PYENV_HOOK_PATH="${PYENV_HOOK_PATH}:${PYENV_INSTALL_PATH}/pyenv.d"
+  PYENV_HOOK_PATH="${PYENV_HOOK_PATH}:${_PYENV_INSTALL_PREFIX}/pyenv.d"
 fi
 PYENV_HOOK_PATH="${PYENV_HOOK_PATH}:/usr/etc/pyenv.d:/usr/local/etc/pyenv.d:/etc/pyenv.d:/usr/lib/pyenv/hooks"
 for plugin_hook in "${PYENV_ROOT}/plugins/"*/etc/pyenv.d; do
diff --git a/libexec/pyenv-init b/libexec/pyenv-init
index cff9a557..7bf9d71c 100755
--- a/libexec/pyenv-init
+++ b/libexec/pyenv-init
@@ -241,7 +241,7 @@ function print_env() {
 }
 
 function print_completion() {
-  completion="${PYENV_INSTALL_PATH}/completions/pyenv.${shell}"
+  completion="${_PYENV_INSTALL_PREFIX}/completions/pyenv.${shell}"
   if [ -r "$completion" ]; then
     echo "source '$completion'"
   fi
diff --git a/plugins/python-build/bin/pyenv-install b/plugins/python-build/bin/pyenv-install
index 68705641..a6e6021a 100755
--- a/plugins/python-build/bin/pyenv-install
+++ b/plugins/python-build/bin/pyenv-install
@@ -265,12 +265,12 @@ for DEFINITION in "${DEFINITIONS[@]}"; do
       echo "See all available versions with \`pyenv install --list'."
       echo
       echo -n "If the version you need is missing, try upgrading pyenv"
-      if [ "${PYENV_INSTALL_PATH}" != "${PYENV_INSTALL_PATH#$(brew --prefix 2>/dev/null)}" ]; then
+      if [[ command -v brew && "${_PYENV_INSTALL_PREFIX}" == "$(brew --prefix)/"* ]; then
         printf ":\n\n"
         echo "  brew update && brew upgrade pyenv"
-      elif [ -d "${PYENV_INSTALL_PATH}/.git" ]; then
+      elif [ -d "${_PYENV_INSTALL_PREFIX}/.git" ]; then
         printf ":\n\n"
-        echo "  cd ${PYENV_INSTALL_PATH} && git pull && cd -"
+        echo "  cd ${_PYENV_INSTALL_PREFIX} && git pull && cd -"
       else
         printf ".\n"
       fi
diff --git a/plugins/python-build/test/pyenv.bats b/plugins/python-build/test/pyenv.bats
index 7e4032aa..3422ed97 100644
--- a/plugins/python-build/test/pyenv.bats
+++ b/plugins/python-build/test/pyenv.bats
@@ -141,7 +141,7 @@ OUT
   stub_python_build "--definitions : echo 2.6.9 2.7.9-rc1 2.7.9-rc2 3.4.2 | tr ' ' $'\\n'"
 
   mkdir "$BATS_TEST_TMPDIR/.git"
-  PYENV_INSTALL_PATH="$BATS_TEST_TMPDIR" run pyenv-install 2.7.9
+  _PYENV_INSTALL_PREFIX="$BATS_TEST_TMPDIR" run pyenv-install 2.7.9
   assert_failure
   assert_output <<OUT
 ERROR
@@ -166,7 +166,7 @@ OUT
   stub_python_build 'echo ERROR >&2 && exit 2' \
     "--definitions : true"
 
-  PYENV_INSTALL_PATH="$BATS_TEST_TMPDIR" run pyenv-install 1.9.3
+  _PYENV_INSTALL_PREFIX="$BATS_TEST_TMPDIR" run pyenv-install 1.9.3
   assert_failure
   assert_output <<OUT
 ERROR
diff --git a/test/--version.bats b/test/--version.bats
index 9e469345..c494b17d 100644
--- a/test/--version.bats
+++ b/test/--version.bats
@@ -3,10 +3,10 @@
 load test_helper
 
 _setup() {
-  export GIT_DIR="${HOME}/.git"
-  mkdir -p "$HOME"
-  git config --global user.name  "Tester"
-  git config --global user.email "tester@test.local"
+  export GIT_DIR="${PYENV_TEST_DIR}/.git"
+  mkdir -p "$GIT_DIR"
+  git config user.name  "Tester"
+  git config user.email "tester@test.local"
   cd "$PYENV_TEST_DIR"
 }
 
diff --git a/test/init.bats b/test/init.bats
index 9463ab75..99587a35 100755
--- a/test/init.bats
+++ b/test/init.bats
@@ -36,10 +36,9 @@ create_executable() {
 }
 
 @test "setup shell completions" {
-  exec_root="$(cd $BATS_TEST_DIRNAME/.. && pwd)"
-  PYENV_INSTALL_PATH="${exec_root}" run pyenv-init - bash
+  run pyenv-init - bash
   assert_success
-  assert_line "source '${exec_root}/completions/pyenv.bash'"
+  assert_line "source '${_PYENV_INSTALL_PREFIX}/completions/pyenv.bash'"
 }
 
 @test "detect parent shell" {
@@ -62,10 +61,9 @@ OUT
 }
 
 @test "setup shell completions (fish)" {
-  exec_root="$(cd $BATS_TEST_DIRNAME/.. && pwd)"
-  PYENV_INSTALL_PATH="${exec_root}" run pyenv-init - fish
+  run pyenv-init - fish
   assert_success
-  assert_line "source '${exec_root}/completions/pyenv.fish'"
+  assert_line "source '${_PYENV_INSTALL_PREFIX}/completions/pyenv.fish'"
 }
 
 @test "fish instructions" {
diff --git a/test/test_helper.bash b/test/test_helper.bash
index 5d703a19..f3d18fd0 100644
--- a/test/test_helper.bash
+++ b/test/test_helper.bash
@@ -2,7 +2,8 @@ unset PYENV_VERSION
 unset PYENV_DIR
 
 setup() {
-  if ! enable -f "${BATS_TEST_DIRNAME}"/../libexec/pyenv-realpath.dylib realpath 2>/dev/null; then
+  export _PYENV_INSTALL_PREFIX="${BATS_TEST_DIRNAME%/*}"
+  if ! enable -f "${_PYENV_INSTALL_PREFIX}"/libexec/pyenv-realpath.dylib realpath 2>/dev/null; then
     if [ -n "$PYENV_NATIVE_EXT" ]; then
       echo "pyenv: failed to load \`realpath' builtin" >&2
       exit 1
@@ -19,13 +20,12 @@ setup() {
   export BATS_TEST_TMPDIR="${bats_test_tmpdir}"
   export PYENV_TEST_DIR="${BATS_TEST_TMPDIR}/pyenv"
   export PYENV_ROOT="${PYENV_TEST_DIR}/root"
-  export PYENV_INSTALL_PATH="${PYENV_TEST_DIR}"
   export HOME="${PYENV_TEST_DIR}/home"
   export PYENV_HOOK_PATH="${PYENV_ROOT}/pyenv.d"
 
   PATH=/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin
   PATH="${PYENV_TEST_DIR}/bin:$PATH"
-  PATH="${BATS_TEST_DIRNAME%/*}/libexec:$PATH"
+  PATH="${_PYENV_INSTALL_PREFIX}/libexec:$PATH"
   PATH="${BATS_TEST_DIRNAME}/libexec:$PATH"
   PATH="${PYENV_ROOT}/shims:$PATH"
   export PATH