diff --git a/scripts/test-install-cni.sh b/scripts/test-install-cni.sh
index bdaa11f0e..87bf7bacb 100755
--- a/scripts/test-install-cni.sh
+++ b/scripts/test-install-cni.sh
@@ -52,6 +52,7 @@ function cleanup_envs() {
   export -n \
     CALICO_CNI_SPEC_TEMPLATE_FILE \
     CALICO_CNI_SPEC_TEMPLATE \
+    CILIUM_FAST_START_NAMESPACES \
     CILIUM_HEALTHZ_PORT \
     CILIUM_HEALTH_MAX_WAIT_TIME \
     CNI_SPEC_IPV6_ROUTE \