diff --git a/tests/init.sh b/tests/init.sh
old mode 100644
new mode 100755
index cbbf8af9d..9503a83a3
--- a/tests/init.sh
+++ b/tests/init.sh
@@ -1,8 +1,14 @@
+set -eu -o pipefail
+
 source common.sh
 
 test -n "$TEST_ROOT"
 if test -d "$TEST_ROOT"; then
     chmod -R u+w "$TEST_ROOT"
+    # We would delete any daemon socket, so let's stop the daemon first.
+    if [[ -n "${NIX_DAEMON_PACKAGE:-}" ]]; then
+        killDaemon
+    fi
     rm -rf "$TEST_ROOT"
 fi
 mkdir "$TEST_ROOT"