diff --git a/libraries/AP_Soaring/AP_Soaring.cpp b/libraries/AP_Soaring/AP_Soaring.cpp
index 0a546fbab3..536c3de5f3 100644
--- a/libraries/AP_Soaring/AP_Soaring.cpp
+++ b/libraries/AP_Soaring/AP_Soaring.cpp
@@ -387,7 +387,7 @@ float SoaringController::McCready(float alt)
     return thermal_vspeed;
 }
 
-bool SoaringController::is_active()
+bool SoaringController::is_active() const
 {
     if (!soar_active) {
         return false;
diff --git a/libraries/AP_Soaring/AP_Soaring.h b/libraries/AP_Soaring/AP_Soaring.h
index d3c4351302..79bdb944f2 100644
--- a/libraries/AP_Soaring/AP_Soaring.h
+++ b/libraries/AP_Soaring/AP_Soaring.h
@@ -96,8 +96,8 @@ public:
     void init_cruising();
     void update_thermalling();
     void update_cruising();
-    bool is_active();
-    bool get_throttle_suppressed()
+    bool is_active() const;
+    bool get_throttle_suppressed() const
     {
         return _throttle_suppressed;
     }