diff --git a/src/vs/vscode.d.ts b/src/vs/vscode.d.ts
index 117744ceb92..ada25847aad 100644
--- a/src/vs/vscode.d.ts
+++ b/src/vs/vscode.d.ts
@@ -1905,7 +1905,7 @@ declare module 'vscode' {
 		 * @param pattern A file glob pattern like `*.{ts,js}` that will be matched on file paths
 		 * relative to the base path.
 		 */
-		constructor(base: WorkspaceFolder | string, pattern: string)
+		constructor(base: Uri | WorkspaceFolder | string, pattern: string)
 	}
 
 	/**
diff --git a/src/vs/workbench/api/common/extHostTypes.ts b/src/vs/workbench/api/common/extHostTypes.ts
index 8788574ca1b..5e103f86870 100644
--- a/src/vs/workbench/api/common/extHostTypes.ts
+++ b/src/vs/workbench/api/common/extHostTypes.ts
@@ -2193,9 +2193,9 @@ export class RelativePattern implements IRelativePattern {
 
 	pattern: string;
 
-	constructor(base: vscode.WorkspaceFolder | string, pattern: string) {
+	constructor(base: URI | vscode.WorkspaceFolder | string, pattern: string) {
 		if (typeof base !== 'string') {
-			if (!base || !URI.isUri(base.uri)) {
+			if (!base || !URI.isUri(base) && !URI.isUri(base.uri)) {
 				throw illegalArgument('base');
 			}
 		}
@@ -2206,6 +2206,9 @@ export class RelativePattern implements IRelativePattern {
 
 		if (typeof base === 'string') {
 			this.base = base;
+		} else if (URI.isUri(base)) {
+			this.baseFolder = base;
+			this.base = base.fsPath;
 		} else {
 			this.baseFolder = base.uri;
 			this.base = base.uri.fsPath;