diff --git a/app/src/main/cpp/MicroPhoto.cpp b/app/src/main/cpp/MicroPhoto.cpp
index 5f290e1e..cabd07d1 100644
--- a/app/src/main/cpp/MicroPhoto.cpp
+++ b/app/src/main/cpp/MicroPhoto.cpp
@@ -358,7 +358,7 @@ Java_com_xypower_mpapp_MicroPhotoService_notifyToTakePhoto(
         JNIEnv* env,
         jobject pThis, jlong handler, jint channel, jint preset, jlong scheduleTime, jboolean photoOrVideo) {
 
-    if (channel < 1 || channel > 0x1FF)
+    if (channel < 0 || channel > 0xFFFF)
     {
         return JNI_FALSE;
     }