diff --git a/test/prefix.bats b/test/prefix.bats
index b78b8f94..0376954a 100644
--- a/test/prefix.bats
+++ b/test/prefix.bats
@@ -25,12 +25,13 @@ load test_helper
 }
 
 @test "prefix for system in /" {
-  mkdir -p "${RBENV_TEST_DIR}/bin"
-  touch "${RBENV_TEST_DIR}/bin/rbenv-which"
-  echo "echo /bin/ruby" >"${RBENV_TEST_DIR}/bin/rbenv-which"
-  chmod +x "${RBENV_TEST_DIR}/bin/rbenv-which"
+  mkdir -p "${BATS_TEST_DIRNAME}/libexec"
+  touch "${BATS_TEST_DIRNAME}/libexec/rbenv-which"
+  echo "echo /bin/ruby" >"${BATS_TEST_DIRNAME}/libexec/rbenv-which"
+  chmod +x "${BATS_TEST_DIRNAME}/libexec/rbenv-which"
   RBENV_VERSION="system" run rbenv-prefix
   assert_success "/"
+  rm -f "${BATS_TEST_DIRNAME}/libexec/rbenv-which"
 }
 
 @test "prefix for invalid system" {
diff --git a/test/test_helper.bash b/test/test_helper.bash
index a6cbb74e..aef883a4 100644
--- a/test/test_helper.bash
+++ b/test/test_helper.bash
@@ -20,10 +20,10 @@ if [ -z "$RBENV_TEST_DIR" ]; then
   export RBENV_HOOK_PATH="${RBENV_ROOT}/rbenv.d"
 
   PATH=/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin
+  PATH="${RBENV_TEST_DIR}/bin:$PATH"
   PATH="${BATS_TEST_DIRNAME}/../libexec:$PATH"
   PATH="${BATS_TEST_DIRNAME}/libexec:$PATH"
   PATH="${RBENV_ROOT}/shims:$PATH"
-  PATH="${RBENV_TEST_DIR}/bin:$PATH"
   export PATH
 
   for xdg_var in `env 2>/dev/null | grep ^XDG_ | cut -d= -f1`; do unset "$xdg_var"; done