diff --git a/setup/start.sh b/setup/start.sh
index 2801e3239..cb2471d55 100755
--- a/setup/start.sh
+++ b/setup/start.sh
@@ -123,8 +123,13 @@ if [[ -f "${DATA_DIR}/box/certs/host.cert" && -f "${DATA_DIR}/box/certs/host.key
     cp "${DATA_DIR}/box/certs/host.cert" "${DATA_DIR}/nginx/cert/host.cert"
     cp "${DATA_DIR}/box/certs/host.key" "${DATA_DIR}/nginx/cert/host.key"
 else
-    echo "${arg_tls_cert}" > "${DATA_DIR}/nginx/cert/host.cert"
-    echo "${arg_tls_key}" > "${DATA_DIR}/nginx/cert/host.key"
+    if [[ -z "${arg_tls_cert}" || -z "${arg_tls_key}" ]]; then
+        echo "Creating fallback certs"
+        openssl req -x509 -newkey rsa:2048 -keyout "${DATA_DIR}/nginx/cert/host.key" -out "${DATA_DIR}/nginx/cert/host.cert" -days 3650 -subj "/CN=${arg_fqdn}" -nodes
+    else
+        echo "${arg_tls_cert}" > "${DATA_DIR}/nginx/cert/host.cert"
+        echo "${arg_tls_key}" > "${DATA_DIR}/nginx/cert/host.key"
+    fi
 fi
 
 set_progress "33" "Changing ownership"