diff --git a/app/src/main/cpp/SensorsProtocol.cpp b/app/src/main/cpp/SensorsProtocol.cpp
index 2837a248..c8b6cdf9 100644
--- a/app/src/main/cpp/SensorsProtocol.cpp
+++ b/app/src/main/cpp/SensorsProtocol.cpp
@@ -3737,7 +3737,7 @@ int GM_StartSerialCameraPhoto(int phototime, unsigned char channel, int cmdidx,
 }
 #endif
 
-int CameraPhotoCmd(int phototime, unsigned char channel, int cmdidx, unsigned char bImageSize, unsigned char presetno, char *serfile, unsigned int baud, int addr)
+int CameraPhotoCmd(int phototime, unsigned char channel, int cmdidx, unsigned char bImageSize, unsigned char presetno, const char *serfile, unsigned int baud, int addr)
 {
 	pthread_mutex_lock(&camera_mutex);
 	int flag = 0;