diff --git a/.kokoro/trampoline_v2.sh b/.kokoro/trampoline_v2.sh
index ccba3a8bc..5d6cfcca5 100755
--- a/.kokoro/trampoline_v2.sh
+++ b/.kokoro/trampoline_v2.sh
@@ -154,18 +154,17 @@ if [[ -n "${KOKORO_BUILD_ID:-}" ]]; then
 	gcloud auth configure-docker --quiet
     fi
     pass_down_envvars+=(
-        # KOKORO dynamic variables.
-        "KOKORO_BUILD_NUMBER"
-        "KOKORO_BUILD_ID"
-        "KOKORO_JOB_NAME"
-        "KOKORO_GIT_COMMIT"
-        "KOKORO_GITHUB_COMMIT"
-        "KOKORO_GITHUB_PULL_REQUEST_NUMBER"
-        "KOKORO_GITHUB_PULL_REQUEST_COMMIT"
-        # For flakybot
-        "KOKORO_GITHUB_COMMIT_URL"
-        "KOKORO_GITHUB_PULL_REQUEST_URL"
-        "GOOGLE_CLOUD_SPANNER_MULTIPLEXED_SESSIONS"
+	# KOKORO dynamic variables.
+	"KOKORO_BUILD_NUMBER"
+	"KOKORO_BUILD_ID"
+	"KOKORO_JOB_NAME"
+	"KOKORO_GIT_COMMIT"
+	"KOKORO_GITHUB_COMMIT"
+	"KOKORO_GITHUB_PULL_REQUEST_NUMBER"
+	"KOKORO_GITHUB_PULL_REQUEST_COMMIT"
+	# For flakybot
+	"KOKORO_GITHUB_COMMIT_URL"
+	"KOKORO_GITHUB_PULL_REQUEST_URL"
     )
 elif [[ "${TRAVIS:-}" == "true" ]]; then
     RUNNING_IN_CI="true"