diff --git a/plugins/pyenv-binary/libexec/pyenv-binary-save b/plugins/pyenv-binary/libexec/pyenv-binary-save
index 3caf2ba2..16019c71 100755
--- a/plugins/pyenv-binary/libexec/pyenv-binary-save
+++ b/plugins/pyenv-binary/libexec/pyenv-binary-save
@@ -92,7 +92,7 @@ fi
 if [ "$os" = "Linux" ]; then
   libc="$(getconf GNU_LIBC_VERSION 2>/dev/null || true)"
 fi
-if [ "$os" != "Darwin" ] && ! LC_ALL=C readelf --version >/dev/null 2>&1; then
+if [ "$os" != "Darwin" ] && ! LC_ALL=C readelf --version &>/dev/null; then
   echo "pyenv-binary: need readelf to inspect shared libraries" >&2
   exit 1
 fi
diff --git a/plugins/pyenv-binary/test/save.bats b/plugins/pyenv-binary/test/save.bats
index bb4e6e8a..9c2d745a 100644
--- a/plugins/pyenv-binary/test/save.bats
+++ b/plugins/pyenv-binary/test/save.bats
@@ -2,10 +2,6 @@
 
 load test_helper
 
-_setup() {
-  create_path_executable readelf "exit 0"
-}
-
 create_version() {
   mkdir -p "${PYENV_ROOT}/versions/$1/bin"
 }
diff --git a/test/Dockerfile b/test/Dockerfile
index 659c2de7..58fd3f21 100644
--- a/test/Dockerfile
+++ b/test/Dockerfile
@@ -12,7 +12,7 @@ FROM bash:$BASH
     apk add sed coreutils findutils \
   ;fi
   # Bats
-  RUN apk add --update parallel ncurses git \
+  RUN apk add --update parallel ncurses git binutils \
         && mkdir -p ~/.parallel \
         && touch ~/.parallel/will-cite
   COPY --from=bats /root/bats-core /root/bats-core
diff --git a/test/test_helper.bash b/test/test_helper.bash
index c989de67..2d3d1c11 100644
--- a/test/test_helper.bash
+++ b/test/test_helper.bash
@@ -165,7 +165,7 @@ path_without() {
       if [ "$found" != "${PYENV_ROOT}/shims" ]; then
         alt="${PYENV_TEST_DIR}/$(echo "${found#/}" | tr '/' '-')"
         mkdir -p "$alt"
-        for util in basename bash cut greadlink head mkdir readlink sed sort tr xargs; do
+        for util in basename bash cut dirname find greadlink gzip head mkdir readlink sed sort tar tr xargs; do
           if [ -x "${found}/$util" ]; then
             ln -s "${found}/$util" "${alt}/$util"
           fi