diff --git a/src/combineReducers.ts b/src/combineReducers.ts
index bf4520f6d2..7bd5a8fd8e 100644
--- a/src/combineReducers.ts
+++ b/src/combineReducers.ts
@@ -176,8 +176,10 @@ export default function combineReducers<M extends UnknownReducersMapObject>(
       const key = finalReducerKeys[i]
       const reducer = finalReducers[key]
       const previousStateForKey = state[key]
-      // @ts-ignore
-      const nextStateForKey = reducer(previousStateForKey, action)
+      const nextStateForKey = reducer(
+        previousStateForKey as undefined,
+        action as never
+      )
       if (typeof nextStateForKey === 'undefined') {
         const actionType = action && action.type
         throw new Error(
@@ -188,8 +190,8 @@ export default function combineReducers<M extends UnknownReducersMapObject>(
             `If you want this reducer to hold no value, you can return null instead of undefined.`
         )
       }
-      // @ts-ignore
-      nextState[key as keyof typeof nextState] = nextStateForKey
+      nextState[key as keyof typeof nextState] =
+        nextStateForKey as (typeof nextState)[keyof typeof nextState]
       hasChanged = hasChanged || nextStateForKey !== previousStateForKey
     }
     hasChanged =