diff --git a/libraries/AP_MSP/AP_MSP_Telem_Backend.cpp b/libraries/AP_MSP/AP_MSP_Telem_Backend.cpp
index af28097e9d..6240f7779c 100644
--- a/libraries/AP_MSP/AP_MSP_Telem_Backend.cpp
+++ b/libraries/AP_MSP/AP_MSP_Telem_Backend.cpp
@@ -820,7 +820,7 @@ MSPCommandResult AP_MSP_Telem_Backend::msp_process_out_altitude(sbuf_t *dst)
     update_home_pos(home_state);
 
     sbuf_write_u32(dst, home_state.rel_altitude_cm);                // relative altitude cm
-    sbuf_write_u16(dst, (int16_t)get_vspeed_ms() * 100);            // climb rate cm/s
+    sbuf_write_u16(dst, int16_t(get_vspeed_ms() * 100));            // climb rate cm/s
     return MSP_RESULT_ACK;
 }