diff --git a/src/compiler/path.ts b/src/compiler/path.ts
index 32fa57ec806..4d283266d91 100644
--- a/src/compiler/path.ts
+++ b/src/compiler/path.ts
@@ -690,7 +690,7 @@ export function removeTrailingDirectorySeparator(path: string): string;
 /** @internal */
 export function removeTrailingDirectorySeparator(path: string) {
     if (hasTrailingDirectorySeparator(path)) {
-        return path.substr(0, path.length - 1);
+        return path.slice(0, -1);
     }
 
     return path;