diff --git a/include/update_engine/dbus-constants.h b/include/update_engine/dbus-constants.h
new file mode 100644
index 0000000..94e35f1
--- /dev/null
+++ b/include/update_engine/dbus-constants.h
@@ -0,0 +1,51 @@
+// Copyright 2015 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef SYSTEM_API_DBUS_UPDATE_ENGINE_DBUS_CONSTANTS_H_
+#define SYSTEM_API_DBUS_UPDATE_ENGINE_DBUS_CONSTANTS_H_
+
+namespace update_engine {
+const char kUpdateEngineInterface[] = "org.chromium.UpdateEngineInterface";
+const char kUpdateEngineServicePath[] = "/org/chromium/UpdateEngine";
+const char kUpdateEngineServiceName[] = "org.chromium.UpdateEngine";
+
+// Generic UpdateEngine D-Bus error.
+static const char* const kUpdateEngineServiceErrorFailed =
+    "org.chromium.UpdateEngine.Error.Failed";
+
+// Methods.
+const char kAttemptUpdate[] = "AttemptUpdate";
+const char kGetStatus[] = "GetStatus";
+const char kRebootIfNeeded[] = "RebootIfNeeded";
+const char kSetChannel[] = "SetChannel";
+const char kGetChannel[] = "GetChannel";
+const char kAttemptRollback[] = "AttemptRollback";
+const char kCanRollback[] = "CanRollback";
+
+// Signals.
+const char kStatusUpdate[] = "StatusUpdate";
+
+// Flags used in the AttemptUpdateWithFlags() D-Bus method.
+typedef enum {
+  kAttemptUpdateFlagNonInteractive = (1<<0)
+} AttemptUpdateFlags;
+
+// Operations contained in StatusUpdate signals.
+const char kUpdateStatusIdle[] = "UPDATE_STATUS_IDLE";
+const char kUpdateStatusCheckingForUpdate[] =
+    "UPDATE_STATUS_CHECKING_FOR_UPDATE";
+const char kUpdateStatusUpdateAvailable[] = "UPDATE_STATUS_UPDATE_AVAILABLE";
+const char kUpdateStatusDownloading[] = "UPDATE_STATUS_DOWNLOADING";
+const char kUpdateStatusVerifying[] = "UPDATE_STATUS_VERIFYING";
+const char kUpdateStatusFinalizing[] = "UPDATE_STATUS_FINALIZING";
+const char kUpdateStatusUpdatedNeedReboot[] =
+    "UPDATE_STATUS_UPDATED_NEED_REBOOT";
+const char kUpdateStatusReportingErrorEvent[] =
+    "UPDATE_STATUS_REPORTING_ERROR_EVENT";
+const char kUpdateStatusAttemptingRollback[] =
+    "UPDATE_STATUS_ATTEMPTING_ROLLBACK";
+const char kUpdateStatusDisabled[] = "UPDATE_STATUS_DISABLED";
+}  // namespace update_engine
+
+#endif  // SYSTEM_API_DBUS_UPDATE_ENGINE_DBUS_CONSTANTS_H_