diff --git a/gtsam_unstable/slam/PoseTranslationPrior.h b/gtsam_unstable/slam/PoseTranslationPrior.h
index ba023c0e3..9fc2bb423 100644
--- a/gtsam_unstable/slam/PoseTranslationPrior.h
+++ b/gtsam_unstable/slam/PoseTranslationPrior.h
@@ -25,8 +25,8 @@ bool isRotFirst() {
 }
 
 // Instantiate for common poses
-template<> bool isRotFirst<Pose3>() { return true; }
-template<> bool isRotFirst<Pose2>() { return false; }
+template<> inline bool isRotFirst<Pose3>() { return true; }
+template<> inline bool isRotFirst<Pose2>() { return false; }
 
 } // \namespace pose_traits