diff --git a/libraries/AP_NavEKF3/AP_NavEKF3.cpp b/libraries/AP_NavEKF3/AP_NavEKF3.cpp
index ac044a4058..2d94914a45 100644
--- a/libraries/AP_NavEKF3/AP_NavEKF3.cpp
+++ b/libraries/AP_NavEKF3/AP_NavEKF3.cpp
@@ -1440,7 +1440,7 @@ void  NavEKF3::getFilterGpsStatus(int8_t instance, nav_gps_status &status) const
 }
 
 // send an EKF_STATUS_REPORT message to GCS
-void NavEKF3::send_status_report(mavlink_channel_t chan)
+void NavEKF3::send_status_report(mavlink_channel_t chan) const
 {
     if (core) {
         core[primary].send_status_report(chan);
diff --git a/libraries/AP_NavEKF3/AP_NavEKF3.h b/libraries/AP_NavEKF3/AP_NavEKF3.h
index 3af0b21c59..715da8a5e8 100644
--- a/libraries/AP_NavEKF3/AP_NavEKF3.h
+++ b/libraries/AP_NavEKF3/AP_NavEKF3.h
@@ -335,7 +335,7 @@ public:
     void getFilterStatus(int8_t instance, nav_filter_status &status) const;
 
     // send an EKF_STATUS_REPORT message to GCS
-    void send_status_report(mavlink_channel_t chan);
+    void send_status_report(mavlink_channel_t chan) const;
 
     // provides the height limit to be observed by the control loops
     // returns false if no height limiting is required
diff --git a/libraries/AP_NavEKF3/AP_NavEKF3_Outputs.cpp b/libraries/AP_NavEKF3/AP_NavEKF3_Outputs.cpp
index 68b30fff4a..ab8abbdb7d 100644
--- a/libraries/AP_NavEKF3/AP_NavEKF3_Outputs.cpp
+++ b/libraries/AP_NavEKF3/AP_NavEKF3_Outputs.cpp
@@ -551,7 +551,7 @@ void  NavEKF3_core::getFilterGpsStatus(nav_gps_status &faults) const
 }
 
 // send an EKF_STATUS message to GCS
-void NavEKF3_core::send_status_report(mavlink_channel_t chan)
+void NavEKF3_core::send_status_report(mavlink_channel_t chan) const
 {
     // prepare flags
     uint16_t flags = 0;
diff --git a/libraries/AP_NavEKF3/AP_NavEKF3_core.h b/libraries/AP_NavEKF3/AP_NavEKF3_core.h
index 0a09d8f55d..f0d9dadaec 100644
--- a/libraries/AP_NavEKF3/AP_NavEKF3_core.h
+++ b/libraries/AP_NavEKF3/AP_NavEKF3_core.h
@@ -327,7 +327,7 @@ public:
     void getFilterStatus(nav_filter_status &status) const;
 
     // send an EKF_STATUS_REPORT message to GCS
-    void send_status_report(mavlink_channel_t chan);
+    void send_status_report(mavlink_channel_t chan) const;
 
     // provides the height limit to be observed by the control loops
     // returns false if no height limiting is required