diff --git a/gtsam/gtsam.i b/gtsam/gtsam.i
index 2e1920641..e405e533c 100644
--- a/gtsam/gtsam.i
+++ b/gtsam/gtsam.i
@@ -852,7 +852,6 @@ class Cal3_S2 {
   gtsam::Point2 principalPoint() const;
   Vector vector() const;
   Matrix K() const;
-  Matrix matrix() const;
   Matrix matrix_inverse() const;
 
   // enabling serialization functionality