diff --git a/pkg/front_end/lib/src/api_unstable/bazel_worker.dart b/pkg/front_end/lib/src/api_unstable/bazel_worker.dart
index c9969c5..2cd528c 100644
--- a/pkg/front_end/lib/src/api_unstable/bazel_worker.dart
+++ b/pkg/front_end/lib/src/api_unstable/bazel_worker.dart
@@ -105,7 +105,8 @@
       ..target = target
       ..fileSystem = fileSystem
       ..omitPlatform = true
-      ..environmentDefines = const {};
+      ..environmentDefines = const {}
+      ..experimentalFlags = experimentalFlags;
 
     processedOpts = new ProcessedOptions(options: options);
     cachedSdkInput = WorkerInputComponent(
diff --git a/pkg/front_end/lib/src/api_unstable/ddc.dart b/pkg/front_end/lib/src/api_unstable/ddc.dart
index a344601..d761b49 100644
--- a/pkg/front_end/lib/src/api_unstable/ddc.dart
+++ b/pkg/front_end/lib/src/api_unstable/ddc.dart
@@ -155,7 +155,8 @@
       oldState.incrementalCompiler == null ||
       oldState.options.compileSdk != compileSdk ||
       cachedSdkInput == null ||
-      !digestsEqual(cachedSdkInput.digest, sdkDigest)) {
+      !digestsEqual(cachedSdkInput.digest, sdkDigest) ||
+      !equalMaps(oldState.options.experimentalFlags, experiments)) {
     // No previous state.
     options = new CompilerOptions()
       ..compileSdk = compileSdk