diff --git a/src/vs/base/common/uri.ts b/src/vs/base/common/uri.ts
index 80941c5c1d37f31c20d2967d4f90f89835b2fc74..8fbecabfd801b2661a82461ebc2570dabb8383ef 100644
--- a/src/vs/base/common/uri.ts
+++ b/src/vs/base/common/uri.ts
@@ -169,7 +169,7 @@ export class URI implements UriComponents {
 	/**
 	 * @internal
 	 */
-	protected constructor(schemeOrData: string | UriComponents, authority?: string, path?: string, query?: string, fragment?: string, _strict?: boolean) {
+	protected constructor(schemeOrData: string | UriComponents, authority?: string, path?: string, query?: string, fragment?: string, _strict: boolean = false) {
 
 		if (typeof schemeOrData === 'object') {
 			this.scheme = schemeOrData.scheme || _empty;