diff --git a/packages/vscode-messenger-common/src/messages.ts b/packages/vscode-messenger-common/src/messages.ts
index f738835..7407060 100644
--- a/packages/vscode-messenger-common/src/messages.ts
+++ b/packages/vscode-messenger-common/src/messages.ts
@@ -201,7 +201,7 @@ export class DeferredRequest<R = any> {
  * set a listener that is called when the request is canceled.
  */
 export interface CancellationToken {
-    isCanceled(): boolean;
+    readonly isCanceled: boolean;
     onCancel: ((reason: string) => void) | undefined;
 }
 
@@ -220,7 +220,7 @@ export class CancellationTokenImpl implements CancellationToken {
         this.onCancel?.(reason);
     }
 
-    public isCanceled(): boolean {
+    get isCanceled(): boolean {
         return this.canceled;
     }
 
diff --git a/packages/vscode-messenger-webview/src/messenger.ts b/packages/vscode-messenger-webview/src/messenger.ts
index a37e3c3..91b8a1b 100644
--- a/packages/vscode-messenger-webview/src/messenger.ts
+++ b/packages/vscode-messenger-webview/src/messenger.ts
@@ -81,7 +81,7 @@ export class Messenger implements MessengerAPI {
                     };
                     this.vscode.postMessage(response);
                 } catch (error) {
-                    if (cancelable.isCanceled()) {
+                    if (cancelable.isCanceled) {
                         // Don't report the error if request was canceled.
                         return;
                     }
diff --git a/packages/vscode-messenger/src/messenger.ts b/packages/vscode-messenger/src/messenger.ts
index 2a4392b..2de993d 100644
--- a/packages/vscode-messenger/src/messenger.ts
+++ b/packages/vscode-messenger/src/messenger.ts
@@ -196,7 +196,7 @@ export class Messenger implements MessengerAPI {
                 this.log(`Failed to send result message: ${participantToString(response.receiver)}`, 'error');
             }
         } catch (error) {
-            if (cancelable?.isCanceled()) {
+            if (cancelable?.isCanceled) {
                 // Don't report the error if request was canceled.
                 return;
             }