diff --git a/lib/src/executable.dart b/lib/src/executable.dart
index 4824fc16..f60f0d35 100644
--- a/lib/src/executable.dart
+++ b/lib/src/executable.dart
@@ -184,14 +184,14 @@ Future<String> _compileStdin(
   var importer = new FilesystemImporter('.');
   if (asynchronous) {
     return await compileStringAsync(text,
-        indented: indented,
+        indented: indented ?? false,
         logger: logger,
         style: style,
         importer: importer,
         loadPaths: loadPaths);
   } else {
     return compileString(text,
-        indented: indented,
+        indented: indented ?? false,
         logger: logger,
         style: style,
         importer: importer,
diff --git a/test/dart_cli_test.dart b/test/dart_cli_test.dart
index 51ba30e9..d8c18e16 100644
--- a/test/dart_cli_test.dart
+++ b/test/dart_cli_test.dart
@@ -26,5 +26,7 @@ void main() {
 }
 
 Future<TestProcess> _runSass(Iterable<String> arguments) => TestProcess.start(
-    Platform.executable, [p.absolute("bin/sass.dart")]..addAll(arguments),
-    workingDirectory: d.sandbox, description: "sass");
+    Platform.executable,
+    ["--checked", p.absolute("bin/sass.dart")]..addAll(arguments),
+    workingDirectory: d.sandbox,
+    description: "sass");