diff --git a/src/main/acio/mdxf.h b/src/main/acio/mdxf.h
index 9bb5005..2ddf2ae 100644
--- a/src/main/acio/mdxf.h
+++ b/src/main/acio/mdxf.h
@@ -15,6 +15,7 @@ union mdxf_panel_sensors_individual {
         uint8_t left : 1;
         uint8_t down : 1;
         uint8_t up : 1;
+        uint8_t unused : 4;
     };
     uint8_t raw;
 };
diff --git a/src/main/aciodrv/rvol.c b/src/main/aciodrv/rvol.c
index 375d0cc..3a06cee 100644
--- a/src/main/aciodrv/rvol.c
+++ b/src/main/aciodrv/rvol.c
@@ -56,6 +56,7 @@ bool aciodrv_rvol_poll(
     struct ac_io_message msg;
 
     log_assert(device);
+    log_assert(pout);
 
     msg.addr = node_id + 1;
     msg.cmd.code = ac_io_u16(AC_IO_CMD_RVOL_POLL);