diff --git a/src/vs/workbench/api/browser/mainThreadWorkspace.ts b/src/vs/workbench/api/browser/mainThreadWorkspace.ts
index 12441286ddc..880a6026dc7 100644
--- a/src/vs/workbench/api/browser/mainThreadWorkspace.ts
+++ b/src/vs/workbench/api/browser/mainThreadWorkspace.ts
@@ -28,6 +28,7 @@ import { IEditSessionIdentityService } from 'vs/platform/workspace/common/editSe
 import { EditorResourceAccessor, SaveReason, SideBySideEditor } from 'vs/workbench/common/editor';
 import { coalesce, firstOrDefault } from 'vs/base/common/arrays';
 import { ICanonicalUriService } from 'vs/platform/workspace/common/canonicalUri';
+import { revive } from 'vs/base/common/marshalling';
 
 @extHostNamedCustomer(MainContext.MainThreadWorkspace)
 export class MainThreadWorkspace implements MainThreadWorkspaceShape {
@@ -146,7 +147,7 @@ export class MainThreadWorkspace implements MainThreadWorkspaceShape {
 
 		const query = this._queryBuilder.file(
 			includeFolder ? [includeFolder] : workspace.folders,
-			options
+			revive(options)
 		);
 
 		return this._searchService.fileSearch(query, token).then(result => {
@@ -164,7 +165,7 @@ export class MainThreadWorkspace implements MainThreadWorkspaceShape {
 		const workspace = this._contextService.getWorkspace();
 		const folders = folder ? [folder] : workspace.folders.map(folder => folder.uri);
 
-		const query = this._queryBuilder.text(pattern, folders, options);
+		const query = this._queryBuilder.text(pattern, folders, revive(options));
 		query._reason = 'startTextSearch';
 
 		const onProgress = (p: ISearchProgressItem) => {