diff --git a/packages/rstream/src/subs/sidechain-partition.ts b/packages/rstream/src/subs/sidechain-partition.ts
index 1855959bfb..b48a7d67ca 100644
--- a/packages/rstream/src/subs/sidechain-partition.ts
+++ b/packages/rstream/src/subs/sidechain-partition.ts
@@ -64,7 +64,7 @@ export class SidechainPartition<T, S> extends ASidechain<T, S, T[]> {
                     $this.dispatch($this.buf);
                 }
                 $this.done();
-                delete $this.buf;
+                delete (<any>$this).buf;
             },
         });
     }
diff --git a/packages/rstream/src/subs/tunnel.ts b/packages/rstream/src/subs/tunnel.ts
index 896b0ebfec..2d9dcd3e35 100644
--- a/packages/rstream/src/subs/tunnel.ts
+++ b/packages/rstream/src/subs/tunnel.ts
@@ -113,7 +113,7 @@ export class Tunnel<A, B> extends Subscription<A, B> {
             setTimeout(() => {
                 LOGGER.info("terminating workers...");
                 this.workers.forEach((worker) => worker && worker.terminate());
-                delete this.workers;
+                delete (<any>this).workers;
             }, this.terminate);
         }
     }