diff --git a/packages/node_modules/overmind-devtools-client/src/overmind/operators.ts b/packages/node_modules/overmind-devtools-client/src/overmind/operators.ts
index 358133a4..50034972 100644
--- a/packages/node_modules/overmind-devtools-client/src/overmind/operators.ts
+++ b/packages/node_modules/overmind-devtools-client/src/overmind/operators.ts
@@ -159,8 +159,13 @@ export const updateDerived: () => Operator<DerivedMessage> = () =>
     const actualPath = Array.isArray(message.data.path) ? message.data.path : (message.data.path as any).split('.')
     const path = actualPath.slice()
     const key = path.pop()
-    const target = path.reduce((aggr, pathKey) => aggr[pathKey], appState)
-    target[key] = message.data.value
+    const target = path.reduce((aggr, pathKey) => aggr && aggr['__CLASS__'] ? aggr[pathKey].value : aggr[pathKey], appState)
+    
+    if (target['__CLASS__']) {
+      target.value[key] = message.data.value
+    } else {
+      target[key] = message.data.value
+    }
 
     state.apps[message.appName].derived[actualPath.join(state.apps[message.appName].delimiter)] = message.data
   })