diff --git a/libraries/AP_Mount/AP_Mount_Viewpro.cpp b/libraries/AP_Mount/AP_Mount_Viewpro.cpp
index aa443483e82b28..1855b075fe6902 100644
--- a/libraries/AP_Mount/AP_Mount_Viewpro.cpp
+++ b/libraries/AP_Mount/AP_Mount_Viewpro.cpp
@@ -624,7 +624,7 @@ bool AP_Mount_Viewpro::send_tracking_command(TrackingCommand cmd, uint8_t value)
 }
 
 // send camera command2 and corresponding parameter values
-bool AP_Mount_Viewpro::send_tracking_command2(TrackingCommand2 cmd, uint16_t param1, uint16_t param2)
+bool AP_Mount_Viewpro::send_tracking_command2(TrackingCommand2 cmd, int16_t param1, int16_t param2)
 {
     // fill in packet
     const E2Packet e2_packet {
diff --git a/libraries/AP_Mount/AP_Mount_Viewpro.h b/libraries/AP_Mount/AP_Mount_Viewpro.h
index 1100586cd1ce16..4db33e9d87efc8 100644
--- a/libraries/AP_Mount/AP_Mount_Viewpro.h
+++ b/libraries/AP_Mount/AP_Mount_Viewpro.h
@@ -371,7 +371,7 @@ class AP_Mount_Viewpro : public AP_Mount_Backend_Serial
     bool send_tracking_command(TrackingCommand cmd, uint8_t value);
 
     // send camera command2 and corresponding parameter values
-    bool send_tracking_command2(TrackingCommand2 cmd, uint16_t param1, uint16_t param2);
+    bool send_tracking_command2(TrackingCommand2 cmd, int16_t param1, int16_t param2);
 
     // send vehicle attitude and position to gimbal
     bool send_m_ahrs();