diff --git a/src/utils/flattenWhenNode.js b/src/utils/flattenWhenNode.js
index 894d0526..95147cae 100644
--- a/src/utils/flattenWhenNode.js
+++ b/src/utils/flattenWhenNode.js
@@ -1,5 +1,5 @@
 import isMap from 'lodash/isMap';
-import { DEFAULT_NAMESPACE } from '../constants';
+import { DEFAULT_NAMESPACE, ACTION_TYPE_DELIMITER } from '../constants';
 import ownKeys from './ownKeys';
 
 function get(key, x) {
@@ -14,9 +14,12 @@ export default predicate =>
     partialFlatActionType = ''
   ) {
     function connectNamespace(type) {
-      return partialFlatActionType
-        ? `${partialFlatActionType}${namespace}${type}`
-        : type;
+      if (!partialFlatActionType) return type;
+      const types = type.toString().split(ACTION_TYPE_DELIMITER);
+      const partials = partialFlatActionType.split(ACTION_TYPE_DELIMITER);
+      return []
+        .concat(...partials.map(p => types.map(t => `${p}${namespace}${t}`)))
+        .join(ACTION_TYPE_DELIMITER);
     }
 
     function connectPrefix(type) {
diff --git a/test/handleActions.test.js b/test/handleActions.test.js
index 1da92289..208f5d7b 100644
--- a/test/handleActions.test.js
+++ b/test/handleActions.test.js
@@ -529,3 +529,30 @@ test('works with nested reducerMap and identity handlers', () => {
     message: 'hello'
   });
 });
+
+test('works with combineActions nested', () => {
+  const { apiCall1, apiCall2 } = createActions('API_CALL_1', 'API_CALL_2');
+  const {
+    apiCall1: { loading: apiCallLoading1 },
+    apiCall2: { loading: apiCallLoading2 }
+  } = createActions({
+    API_CALL_1: { LOADING: undefined },
+    API_CALL_2: { LOADING: undefined }
+  });
+
+  const reducer = handleActions(
+    {
+      [combineActions(apiCall1, apiCall2)]: {
+        LOADING: (state, { payload: loading }) => ({ loading })
+      }
+    },
+    { loading: false }
+  );
+
+  expect(reducer({ loading: false }, apiCallLoading1(true))).toEqual({
+    loading: true
+  });
+  expect(reducer({ loading: false }, apiCallLoading2(true))).toEqual({
+    loading: true
+  });
+});