diff --git a/.changeset/fix-subsessions-setting-save.md b/.changeset/fix-subsessions-setting-save.md
new file mode 100644
index 0000000..c1ef89a
--- /dev/null
+++ b/.changeset/fix-subsessions-setting-save.md
@@ -0,0 +1,5 @@
+---
+"@jmfederico/pi-web": patch
+---
+
+Persist the Settings → Session daemon tracked subsessions toggle so it remains enabled after restart.
diff --git a/src/server/configRoutes.test.ts b/src/server/configRoutes.test.ts
index 34ce545..d9b7344 100644
--- a/src/server/configRoutes.test.ts
+++ b/src/server/configRoutes.test.ts
@@ -37,11 +37,11 @@ describe("config routes", () => {
     const response = await app.inject({
       method: "PUT",
       url: "/api/config",
-      payload: { config: { host: "0.0.0.0", port: 9000, allowedHosts: true, spawnSessions: true, shortcuts: { "core:view.chat": "mod+1", "core:session.stop": null }, plugins: { info: { enabled: false, settings: { note: "hidden" } } } } },
+      payload: { config: { host: "0.0.0.0", port: 9000, allowedHosts: true, spawnSessions: true, subsessions: true, shortcuts: { "core:view.chat": "mod+1", "core:session.stop": null }, plugins: { info: { enabled: false, settings: { note: "hidden" } } } } },
     });
 
     expect(response.statusCode).toBe(200);
-    expect(savedConfig).toEqual({ host: "0.0.0.0", port: 9000, allowedHosts: true, spawnSessions: true, shortcuts: { "core:view.chat": "mod+1", "core:session.stop": null }, plugins: { info: { enabled: false, settings: { note: "hidden" } } } });
+    expect(savedConfig).toEqual({ host: "0.0.0.0", port: 9000, allowedHosts: true, spawnSessions: true, subsessions: true, shortcuts: { "core:view.chat": "mod+1", "core:session.stop": null }, plugins: { info: { enabled: false, settings: { note: "hidden" } } } });
     expect(response.json<PiWebConfigResponse>().config).toEqual(savedConfig);
   });
 
diff --git a/src/server/configRoutes.ts b/src/server/configRoutes.ts
index afc05f7..478448e 100644
--- a/src/server/configRoutes.ts
+++ b/src/server/configRoutes.ts
@@ -59,6 +59,7 @@ function parseConfigRequest(value: unknown): PiWebConfig {
   const shortcuts = value["shortcuts"];
   const plugins = value["plugins"];
   const spawnSessions = value["spawnSessions"];
+  const subsessions = value["subsessions"];
   if (host !== undefined) {
     if (typeof host !== "string") throw new Error("PI WEB config host must be a string");
     config.host = host;
@@ -74,6 +75,10 @@ function parseConfigRequest(value: unknown): PiWebConfig {
     if (typeof spawnSessions !== "boolean") throw new Error("PI WEB config spawnSessions must be a boolean");
     config.spawnSessions = spawnSessions;
   }
+  if (subsessions !== undefined) {
+    if (typeof subsessions !== "boolean") throw new Error("PI WEB config subsessions must be a boolean");
+    config.subsessions = subsessions;
+  }
   return config;
 }