diff --git a/compat/operator/shareReplay.ts b/compat/operator/shareReplay.ts
index c5a0ebf455..33cd702797 100644
--- a/compat/operator/shareReplay.ts
+++ b/compat/operator/shareReplay.ts
@@ -1,11 +1,18 @@
 import { Observable, SchedulerLike } from 'rxjs';
 import { shareReplay as higherOrder } from 'rxjs/operators';
+import { ShareReplayConfig } from 'rxjs/internal-compatibility';
 
 /**
  * @method shareReplay
  * @owner Observable
  */
-export function shareReplay<T>(this: Observable<T>, bufferSize?: number, windowTime?: number, scheduler?: SchedulerLike):
+export function shareReplay<T>(this: Observable<T>, config: ShareReplayConfig): Observable<T>;
+/** @deprecated Use config parameter */
+export function shareReplay<T>(this: Observable<T>, bufferSize?: number, windowTime?: number, scheduler?: SchedulerLike): Observable<T>;
+export function shareReplay<T>(this: Observable<T>, configOrBufferSize?: ShareReplayConfig | number, windowTime?: number, scheduler?: SchedulerLike):
   Observable<T> {
-  return higherOrder(bufferSize, windowTime, scheduler)(this) as Observable<T>;
+  if (configOrBufferSize && typeof configOrBufferSize === 'object') {
+    return higherOrder(configOrBufferSize as ShareReplayConfig)(this) as Observable<T>;
+  }
+  return higherOrder(configOrBufferSize as number | undefined, windowTime, scheduler)(this) as Observable<T>;
 }
diff --git a/src/internal-compatibility/index.ts b/src/internal-compatibility/index.ts
index a8998475a0..c7b0058207 100644
--- a/src/internal-compatibility/index.ts
+++ b/src/internal-compatibility/index.ts
@@ -23,6 +23,7 @@ export { SubscribeOnObservable } from '../internal/observable/SubscribeOnObserva
 export { Timestamp } from '../internal/operators/timestamp';
 export { TimeInterval } from '../internal/operators/timeInterval';
 export { GroupedObservable } from '../internal/operators/groupBy';
+export { ShareReplayConfig } from '../internal/operators/shareReplay';
 export { ThrottleConfig, defaultThrottleConfig } from '../internal/operators/throttle';
 
 export { rxSubscriber } from '../internal/symbol/rxSubscriber';