diff --git a/libraries/AP_Math/vector3.cpp b/libraries/AP_Math/vector3.cpp
index 771d39c6e4..9636710aa8 100644
--- a/libraries/AP_Math/vector3.cpp
+++ b/libraries/AP_Math/vector3.cpp
@@ -390,7 +390,7 @@ Matrix3<T> Vector3<T>::mul_rowcol(const Vector3<T> &v2) const
                       v1.z * v2.x, v1.z * v2.y, v1.z * v2.z);
 }
 
-// only define for float
+// define for float
 template void Vector3<float>::rotate(enum Rotation);
 template void Vector3<float>::rotate_inverse(enum Rotation);
 template float Vector3<float>::length(void) const;
@@ -413,6 +413,9 @@ template bool Vector3<float>::is_nan(void) const;
 template bool Vector3<float>::is_inf(void) const;
 template float Vector3<float>::angle(const Vector3<float> &v) const;
 
+// define needed ops for Vector3l
+template Vector3<int32_t> &Vector3<int32_t>::operator +=(const Vector3<int32_t> &v);
+
 template void Vector3<double>::rotate(enum Rotation);
 template void Vector3<double>::rotate_inverse(enum Rotation);
 template float Vector3<double>::length(void) const;