diff --git a/modules/step-ca/module.json b/modules/step-ca/module.json
index 013e79d..f9f12b0 100644
--- a/modules/step-ca/module.json
+++ b/modules/step-ca/module.json
@@ -59,6 +59,30 @@
       "mode": "0600",
       "content": "DOCKER_STEPCA_INIT_PASSWORD=${secret:password}\n"
     },
+    {
+      "id": "root-cert-file",
+      "type": "file",
+      "path": "/var/lib/mesh/step-ca/root-cert.pem",
+      "mode": "0600",
+      "owner": "1000:1000",
+      "content": "${secret:root-cert}"
+    },
+    {
+      "id": "root-key-file",
+      "type": "file",
+      "path": "/var/lib/mesh/step-ca/root-key.pem",
+      "mode": "0600",
+      "owner": "1000:1000",
+      "content": "${secret:root-key}"
+    },
+    {
+      "id": "root-key-password-file",
+      "type": "file",
+      "path": "/var/lib/mesh/step-ca/root-key-password.txt",
+      "mode": "0600",
+      "owner": "1000:1000",
+      "content": "${secret:root-key-password}"
+    },
     {
       "id": "server",
       "type": "container",
@@ -79,9 +103,9 @@
       },
       "volumes": [
         "/var/lib/step-ca:/home/step",
-        "/var/lib/mesh/step-ca/root-cert:/run/secrets/root_ca.crt:ro",
-        "/var/lib/mesh/step-ca/root-key:/run/secrets/root_ca_key:ro",
-        "/var/lib/mesh/step-ca/root-key-password:/run/secrets/root_ca_key_password:ro",
+        "/var/lib/mesh/step-ca/root-cert.pem:/run/secrets/root_ca.crt:ro",
+        "/var/lib/mesh/step-ca/root-key.pem:/run/secrets/root_ca_key:ro",
+        "/var/lib/mesh/step-ca/root-key-password.txt:/run/secrets/root_ca_key_password:ro",
         "/var/lib/mesh/step-ca/config.json:/run/config/config.json:ro"
       ]
     }