diff --git a/dwds/lib/src/services/expression_compiler_service.dart b/dwds/lib/src/services/expression_compiler_service.dart
index 74cd13510..e94be84c3 100644
--- a/dwds/lib/src/services/expression_compiler_service.dart
+++ b/dwds/lib/src/services/expression_compiler_service.dart
@@ -71,7 +71,12 @@ class _Compiler {
     List<String> experiments,
     bool verbose,
   ) async {
-    sdkConfiguration.validate();
+    sdkConfiguration.validateSdkDir();
+    if (soundNullSafety) {
+      sdkConfiguration.validateSoundSummaries();
+    } else {
+      sdkConfiguration.validateWeakSummaries();
+    }
 
     final librariesUri = sdkConfiguration.librariesUri!;
     final workerUri = sdkConfiguration.compilerWorkerUri!;
diff --git a/webdev/test/daemon/utils.dart b/webdev/test/daemon/utils.dart
index fcb21d53b..f3ee7822f 100644
--- a/webdev/test/daemon/utils.dart
+++ b/webdev/test/daemon/utils.dart
@@ -38,8 +38,10 @@ Future<String> waitForAppId(TestProcess webdev) async {
 }
 
 Future<String> prepareWorkspace() async {
+  // TODO(elliette): Test on weak null-safety webdevSmoke package as well. See:
+  // https://github.com/dart-lang/webdev/issues/1892
   var exampleDirectory =
-      p.absolute(p.join(p.current, '..', 'fixtures', '_webdevSmoke'));
+      p.absolute(p.join(p.current, '..', 'fixtures', '_webdevSoundSmoke'));
 
   var process = await TestProcess.start(dartPath, ['pub', 'upgrade'],
       workingDirectory: exampleDirectory, environment: getPubEnvironment());