diff --git a/test/prepare.sh b/test/prepare.sh
index 46dae77..bf224a2 100755
--- a/test/prepare.sh
+++ b/test/prepare.sh
@@ -7,7 +7,7 @@ LOGDIR="${LOGDIR:-/tmp/logs}"
 CONTAINER_RUNTIME="${CONTAINER_RUNTIME:-}"
 CERT_MANAGER_VERSION="${CERT_MANAGER_VERSION:-1.16.1}"
 
-. "$(dirname $0)/testing.env"
+. "$(dirname "$0")/testing.env"
 
 mkdir -p "${LOGDIR}"