diff --git a/libraries/AP_Math/vector2.cpp b/libraries/AP_Math/vector2.cpp
index a0c4fa219b..e9bc0e86a8 100644
--- a/libraries/AP_Math/vector2.cpp
+++ b/libraries/AP_Math/vector2.cpp
@@ -451,3 +451,4 @@ template bool Vector2<long>::operator ==(const Vector2<long> &v) const;
 
 // define for int
 template bool Vector2<int>::operator ==(const Vector2<int> &v) const;
+template bool Vector2<int>::operator !=(const Vector2<int> &v) const;