diff --git a/gtsam/gtsam.i b/gtsam/gtsam.i
index 94d10953b..f17679739 100644
--- a/gtsam/gtsam.i
+++ b/gtsam/gtsam.i
@@ -3123,6 +3123,8 @@ class ShonanAveraging2 {
   ShonanAveraging2(string g2oFile);
   ShonanAveraging2(string g2oFile,
                    const gtsam::ShonanAveragingParameters2 &parameters);
+  ShonanAveraging2(const gtsam::BetweenFactorPose2s &factors,
+                   const gtsam::ShonanAveragingParameters2 &parameters);
 
   // Query properties
   size_t nrUnknowns() const;