diff --git a/scripts/run-tests.sh b/scripts/run-tests.sh
index 7e36214..7106bba 100755
--- a/scripts/run-tests.sh
+++ b/scripts/run-tests.sh
@@ -1,9 +1,9 @@
-#!/usr/bin/env bash
+#!/bin/bash
 set -euo pipefail
-ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+ROOT="$(cd -- "$(dirname -- "$0")" && pwd)"
 cd "$ROOT"
 if ! command -v xcodebuild >/dev/null 2>&1; then
-  echo "ERROR: Xcode and xcodebuild are required on macOS." >&2
+  echo 'ERROR: Xcode and xcodebuild are required on macOS.' >&2
   exit 1
 fi
 mkdir -p test-results
@@ -18,14 +18,13 @@ if xcodebuild test \
   -destination 'platform=macOS,arch=arm64' \
   -derivedDataPath "$ROOT/build" \
   -resultBundlePath "$RESULT" \
-  -arch arm64 \
   ONLY_ACTIVE_ARCH=YES \
   ENABLE_TESTABILITY=YES \
   SWIFT_ENABLE_EXPLICIT_MODULES=NO \
   CODE_SIGNING_ALLOWED=NO 2>&1 | tee "$LOG"; then
   STATUS=0
 else
-  STATUS=$?
+  STATUS=${PIPESTATUS[0]}
 fi
 printf '\nTest log: %s\nTest results: %s\n' "$LOG" "$RESULT"
 exit "$STATUS"