diff --git a/src/vs/platform/agentHost/node/agentService.ts b/src/vs/platform/agentHost/node/agentService.ts
index 1408cd840549d..eefdf2a2cac0c 100644
--- a/src/vs/platform/agentHost/node/agentService.ts
+++ b/src/vs/platform/agentHost/node/agentService.ts
@@ -4406,7 +4406,7 @@ export class AgentService extends Disposable implements IAgentService {
 			const sessionArchived = ((sessionState?.status ?? 0) & SessionStatus.IsArchived) === SessionStatus.IsArchived;
 			const turn = chatState?.turns.at(-1);
 			const errorPart = getErrorResponsePart(turn);
-			const provider = this._findProviderForSession(sessionChannel);
+			const provider = this._providerService.getProviderForSession(sessionChannel);
 			if (chatState?.activeTurn) {
 				this._stateManager.rejectClientAction(channel, action, origin, 'Cannot resume while a turn is active.');
 				return;
diff --git a/src/vs/platform/agentHost/test/node/agentService.test.ts b/src/vs/platform/agentHost/test/node/agentService.test.ts
index 13a6169ed1ec6..10df6315329b8 100644
--- a/src/vs/platform/agentHost/test/node/agentService.test.ts
+++ b/src/vs/platform/agentHost/test/node/agentService.test.ts
@@ -554,7 +554,7 @@ suite('AgentService (node dispatcher)', () => {
 
 		suite('failed turn resume', () => {
 			async function createErroredTurn(): Promise<{ session: URI; chat: string }> {
-				service.registerProvider(copilotAgent);
+				registerTestAgentProvider(service, copilotAgent);
 				const session = await service.createSession({ provider: 'copilot' });
 				const chat = buildDefaultChatUri(session.toString());
 				const stateManager = getStateManager(service);