diff --git a/src/vs/editor/browser/services/standaloneThemeServiceImpl.ts b/src/vs/editor/browser/services/standaloneThemeServiceImpl.ts
index e94e04728725bd6208dcf5e2cebc4fb51b2bde37..09969e5f76853267f782e2a5d6a1edf33b35da30 100644
--- a/src/vs/editor/browser/services/standaloneThemeServiceImpl.ts
+++ b/src/vs/editor/browser/services/standaloneThemeServiceImpl.ts
@@ -39,6 +39,7 @@ class StandaloneTheme implements IStandaloneTheme {
 			this.id = base;
 			this.selector = base;
 		}
+		this.base = base;
 		this.rules = rules;
 		this.colors = {};
 		for (let id in colors) {