diff --git a/Eigen/src/Geometry/Transform.h b/Eigen/src/Geometry/Transform.h
index a694673eb..9ae5f4720 100644
--- a/Eigen/src/Geometry/Transform.h
+++ b/Eigen/src/Geometry/Transform.h
@@ -37,7 +37,7 @@ struct transform_traits
     Dim = Transform::Dim,
     HDim = Transform::HDim,
     Mode = Transform::Mode,
-    IsProjective = (Mode==Projective)
+    IsProjective = (int(Mode)==int(Projective))
   };
 };