diff --git a/src/common/create-document-selector.ts b/src/common/create-document-selector.ts
index 69d3ba6..3d9bd3e 100644
--- a/src/common/create-document-selector.ts
+++ b/src/common/create-document-selector.ts
@@ -1,8 +1,10 @@
 import { DocumentFilter } from "vscode";
 
+import * as constants from "../constants";
+
 export function createDocumentSelector(language: string): DocumentFilter[] {
     return [
-        { language, scheme: "file" },
-        { language, scheme: "untitled" },
+        { language, scheme: constants.uriSchemes.file },
+        { language, scheme: constants.uriSchemes.untitled },
     ];
 }