diff --git a/packages/grpc-js-core/src/channel.ts b/packages/grpc-js-core/src/channel.ts
index 19ea2080..114dd9b2 100644
--- a/packages/grpc-js-core/src/channel.ts
+++ b/packages/grpc-js-core/src/channel.ts
@@ -43,7 +43,7 @@ export interface ChannelOptions {
   'grpc.primary_user_agent': string;
   'grpc.secondary_user_agent': string;
   'grpc.default_authority': string;
-  'grpc.keealive_time_ms': number;
+  'grpc.keepalive_time_ms': number;
   'grpc.keepalive_timeout_ms': number;
   [key: string]: string|number;
 }
diff --git a/packages/grpc-js-core/src/subchannel.ts b/packages/grpc-js-core/src/subchannel.ts
index 717d5d6f..c0487ab7 100644
--- a/packages/grpc-js-core/src/subchannel.ts
+++ b/packages/grpc-js-core/src/subchannel.ts
@@ -61,10 +61,10 @@ export class Http2SubChannel extends EventEmitter implements SubChannel {
     this.userAgent = userAgent;
 
     if (channelArgs['grpc.keepalive_time_ms']) {
-      this.keepaliveTimeMs = channelArgs['grpc.keepalive_time_ms'] as number;
+      this.keepaliveTimeMs = channelArgs['grpc.keepalive_time_ms']!;
     }
     if (channelArgs['grpc.keepalive_timeout_ms']) {
-      this.keepaliveTimeoutMs = channelArgs['grpc.keepalive_timeout_ms'] as number;
+      this.keepaliveTimeoutMs = channelArgs['grpc.keepalive_timeout_ms']!;
     }
     this.keepaliveIntervalId = setTimeout(() => {}, 0);
     clearTimeout(this.keepaliveIntervalId);