diff --git a/gtsam/slam/slam.i b/gtsam/slam/slam.i
index 58ba37d67..926489153 100644
--- a/gtsam/slam/slam.i
+++ b/gtsam/slam/slam.i
@@ -324,7 +324,7 @@ virtual class KarcherMeanFactor : gtsam::NonlinearFactor {
 };
 
 template <T = {gtsam::Rot3}>
-const T FindKarcherMean<Rot3>(const std::vector<T>& rotations);
+const T FindKarcherMean<T>(const std::vector<T>& rotations);
 
 #include <gtsam/slam/FrobeniusFactor.h>
 gtsam::noiseModel::Isotropic* ConvertNoiseModel(gtsam::noiseModel::Base* model,