diff --git a/libraries/AP_Math/vector2.cpp b/libraries/AP_Math/vector2.cpp
index e613b2af07..0825499d00 100644
--- a/libraries/AP_Math/vector2.cpp
+++ b/libraries/AP_Math/vector2.cpp
@@ -155,3 +155,6 @@ template bool Vector2<float>::operator !=(const Vector2<float> &v) const;
 template bool Vector2<float>::is_nan(void) const;
 template bool Vector2<float>::is_inf(void) const;
 template float Vector2<float>::angle(const Vector2<float> &v) const;
+
+// define for int
+template bool Vector2<int>::operator ==(const Vector2<int> &v) const;