diff --git a/include/nuttx/sensors/sensor.h b/include/nuttx/sensors/sensor.h
index a9ef796eb76..0658d5c7882 100644
--- a/include/nuttx/sensors/sensor.h
+++ b/include/nuttx/sensors/sensor.h
@@ -958,6 +958,14 @@ struct sensor_reginfo_s
 };
 #endif
 
+/* This structure describes the context custom ioctl for device */
+
+struct sensor_ioctl_s
+{
+  size_t len;                  /* The length of argument of ioctl */
+  char data[1];                /* The argument buf of ioctl */
+};
+
 /****************************************************************************
  * Public Function Prototypes
  ****************************************************************************/