diff --git a/file-system/file-system-access.android.ts b/file-system/file-system-access.android.ts
index e06ac1175..5fd9e4ed1 100644
--- a/file-system/file-system-access.android.ts
+++ b/file-system/file-system-access.android.ts
@@ -210,7 +210,7 @@ export class FileSystemAccess {
             var result = "";
             while (true) {
                 line = bufferedReader.readLine();
-                if (types.isUndefined(line)) {
+                if (types.isNullOrUndefined(line)) {
                     break;
                 }