diff --git a/install.sh b/install.sh
index 1e4180e2b7..96f48e6441 100755
--- a/install.sh
+++ b/install.sh
@@ -163,8 +163,8 @@ setup_env() {
             if [ -z "${K3S_URL}" ]; then
                 CMD_K3S=server
             else
-                if [ -z "${K3S_TOKEN}" ] && [ -z "${K3S_CLUSTER_SECRET}" ]; then
-                    fatal "Defaulted k3s exec command to 'agent' because K3S_URL is defined, but K3S_TOKEN or K3S_CLUSTER_SECRET is not defined."
+                if [ -z "${K3S_TOKEN}" ] && [ -z "${K3S_TOKEN_FILE}" ] && [ -z "${K3S_CLUSTER_SECRET}" ]; then
+                    fatal "Defaulted k3s exec command to 'agent' because K3S_URL is defined, but K3S_TOKEN, K3S_TOKEN_FILE or K3S_CLUSTER_SECRET is not defined."
                 fi
                 CMD_K3S=agent
             fi