@@ -1164,6 +1164,16 @@ public static void useDefaultEnvironment() {
 SpannerOptions.environment = SpannerEnvironmentImpl.INSTANCE;
 }
 
+@Override
+protected String getDefaultProject() {
+String projectId = getDefaultProjectId();
+// The project id does not matter if we are using the emulator.
+if (projectId == null && System.getenv("SPANNER_EMULATOR_HOST") != null) {
+return "emulator-project";
+}
+return projectId;
+}
+
 public TransportChannelProvider getChannelProvider() {
 return channelProvider;
 }