diff --git a/e2e/run_test b/e2e/run_test
index 46198e9f1..bfde5728a 100755
--- a/e2e/run_test
+++ b/e2e/run_test
@@ -44,37 +44,38 @@ remove_isolated_env() {
 }
 
 within_isolated_env() {
-  _env \
-    --ignore-environment \
-    --chdir="$TEST_WORKDIR" \
-    - \
-    ROOT="$ROOT" \
-    HOME="$TEST_HOME" \
-    TMPDIR="$TEST_TMPDIR" \
-    SHELL="$(type -p bash)" \
-    PATH="${CARGO_TARGET_DIR:-$ROOT/target}/debug:$HOME/mise/bin:$CARGO_HOME/bin:$TEST_HOME/bin:/opt/homebrew/bin:/usr/local/bin:/usr/bin:/bin" \
-    MISE_DATA_DIR="$MISE_DATA_DIR" \
-    MISE_STATE_DIR="$MISE_STATE_DIR" \
-    MISE_CACHE_DIR="$MISE_CACHE_DIR" \
-    MISE_CONFIG_DIR="$MISE_CONFIG_DIR" \
-    MISE_TMP_DIR="$TEST_TMPDIR" \
-    MISE_SYSTEM_DIR="$MISE_SYSTEM_DIR" \
-    MISE_TRUSTED_CONFIG_PATHS="$TEST_ISOLATED_DIR" \
-    MISE_EXPERIMENTAL=1 \
-    MISE_YES=1 \
-    TEST_NAME="$TEST" \
-    TEST_ROOT="$SCRIPT_DIR" \
-    TEST_SCRIPT="$TEST_SCRIPT" \
-    TEST_DIR="$(dirname "$TEST_SCRIPT")" \
-    GITHUB_ACTION="${GITHUB_ACTION:-}" \
-    GITHUB_API_TOKEN="${GITHUB_API_TOKEN:-}" \
-    CARGO_HOME="$CARGO_HOME" \
-    RUSTUP_HOME="$RUSTUP_HOME" \
-    LLVM_PROFILE_FILE="${LLVM_PROFILE_FILE:-}" \
-    CARGO_LLVM_COV="${CARGO_LLVM_COV:-}" \
-    CARGO_LLVM_COV_SHOW_ENV="${CARGO_LLVM_COV_SHOW_ENV:-}" \
-    CARGO_LLVM_COV_TARGET_DIR="${CARGO_LLVM_COV_TARGET_DIR:-}" \
-    "$@" || return $?
+  (
+    cd "$TEST_ISOLATED_DIR"
+    env -i - \
+      PWD="$TEST_WORKDIR" \
+      ROOT="$ROOT" \
+      HOME="$TEST_HOME" \
+      TMPDIR="$TEST_TMPDIR" \
+      SHELL="$(type -p bash)" \
+      PATH="${CARGO_TARGET_DIR:-$ROOT/target}/debug:$HOME/mise/bin:$CARGO_HOME/bin:$TEST_HOME/bin:/opt/homebrew/bin:/usr/local/bin:/usr/bin:/bin" \
+      MISE_DATA_DIR="$MISE_DATA_DIR" \
+      MISE_STATE_DIR="$MISE_STATE_DIR" \
+      MISE_CACHE_DIR="$MISE_CACHE_DIR" \
+      MISE_CONFIG_DIR="$MISE_CONFIG_DIR" \
+      MISE_TMP_DIR="$TEST_TMPDIR" \
+      MISE_SYSTEM_DIR="$MISE_SYSTEM_DIR" \
+      MISE_TRUSTED_CONFIG_PATHS="$TEST_ISOLATED_DIR" \
+      MISE_EXPERIMENTAL=1 \
+      MISE_YES=1 \
+      TEST_NAME="$TEST" \
+      TEST_ROOT="$SCRIPT_DIR" \
+      TEST_SCRIPT="$TEST_SCRIPT" \
+      TEST_DIR="$(dirname "$TEST_SCRIPT")" \
+      GITHUB_ACTION="${GITHUB_ACTION:-}" \
+      GITHUB_API_TOKEN="${GITHUB_API_TOKEN:-}" \
+      CARGO_HOME="$CARGO_HOME" \
+      RUSTUP_HOME="$RUSTUP_HOME" \
+      LLVM_PROFILE_FILE="${LLVM_PROFILE_FILE:-}" \
+      CARGO_LLVM_COV="${CARGO_LLVM_COV:-}" \
+      CARGO_LLVM_COV_SHOW_ENV="${CARGO_LLVM_COV_SHOW_ENV:-}" \
+      CARGO_LLVM_COV_TARGET_DIR="${CARGO_LLVM_COV_TARGET_DIR:-}" \
+      "$@" || return $?
+  )
 }
 
 run_test() {
@@ -102,14 +103,6 @@ run_test() {
   return "$status"
 }
 
-_env() {
-  if type genv >/dev/null 2>&1; then
-    genv "$@"
-  else
-    env "$@"
-  fi
-}
-
 os() {
   case "$(uname -s)" in
     Darwin) echo "macos" ;;