diff --git a/camera/ndk/include/camera/NdkCameraCaptureSession.h b/camera/ndk/include/camera/NdkCameraCaptureSession.h
index d96f538..16d227a 100644
--- a/camera/ndk/include/camera/NdkCameraCaptureSession.h
+++ b/camera/ndk/include/camera/NdkCameraCaptureSession.h
@@ -33,6 +33,7 @@
  * Do not #include files that aren't part of the NDK.
  */
 #include <sys/cdefs.h>
+#include <stdbool.h>
 
 #include <android/native_window.h>
 #include "NdkCameraError.h"
diff --git a/camera/ndk/include/camera/NdkCameraDevice.h b/camera/ndk/include/camera/NdkCameraDevice.h
index 6c9e85a..2c65529 100644
--- a/camera/ndk/include/camera/NdkCameraDevice.h
+++ b/camera/ndk/include/camera/NdkCameraDevice.h
@@ -153,6 +153,11 @@
 } ACameraDevice_StateCallbacks;
 
 /**
+ * For backward compatiblity.
+ */
+typedef ACameraDevice_StateCallbacks ACameraDevice_stateCallbacks;
+
+/**
  * Close the connection and free this ACameraDevice synchronously. Access to the ACameraDevice
  * after calling this method will cause a crash.
  *