diff --git a/libraries/AP_Math/AP_GeodesicGrid.cpp b/libraries/AP_Math/AP_GeodesicGrid.cpp
index edf7a409f8..af21be10da 100644
--- a/libraries/AP_Math/AP_GeodesicGrid.cpp
+++ b/libraries/AP_Math/AP_GeodesicGrid.cpp
@@ -427,10 +427,10 @@ int AP_GeodesicGrid::_triangle_index(const Vector3f &v, bool inclusive)
         w.z = -w.z;
         break;
     case 1:
-        w(w.y, w.z, -w.x);
+        w = {w.y, w.z, -w.x};
         break;
     case 2:
-        w(w.z, w.x, -w.y);
+        w = {w.z, w.x, -w.y};
         break;
     }
 
diff --git a/libraries/AP_Math/matrix3.cpp b/libraries/AP_Math/matrix3.cpp
index fa8e4dd6e9..f5462ba0ae 100644
--- a/libraries/AP_Math/matrix3.cpp
+++ b/libraries/AP_Math/matrix3.cpp
@@ -62,9 +62,9 @@ void Matrix3<T>::to_euler(float *roll, float *pitch, float *yaw) const
 template <typename T>
 void Matrix3<T>::from_rotation(enum Rotation rotation)
 {
-    (*this).a(1,0,0);
-    (*this).b(0,1,0);
-    (*this).c(0,0,1);
+    (*this).a = {1,0,0};
+    (*this).b = {0,1,0};
+    (*this).c = {0,0,1};
 
     (*this).a.rotate(rotation);
     (*this).b.rotate(rotation);
diff --git a/libraries/AP_Math/vector3.h b/libraries/AP_Math/vector3.h
index 3813b40118..0cd80d4e4a 100644
--- a/libraries/AP_Math/vector3.h
+++ b/libraries/AP_Math/vector3.h
@@ -78,12 +78,6 @@ public:
         , y(y0)
         , z(z0) {}
 
-    // function call operator
-    void operator ()(const T x0, const T y0, const T z0)
-    {
-        x= x0; y= y0; z= z0;
-    }
-
     // test for equality
     bool operator ==(const Vector3<T> &v) const;