diff --git a/cartographer_ros/urdf/backpack_2d.urdf b/cartographer_ros/urdf/backpack_2d.urdf
index a976783..478a311 100644
--- a/cartographer_ros/urdf/backpack_2d.urdf
+++ b/cartographer_ros/urdf/backpack_2d.urdf
@@ -60,7 +60,7 @@
   <joint name="imu_link_joint" type="fixed">
     <parent link="base_link" />
     <child link="imu_link" />
-    <origin xyz="0 0 0" rpy="0 0 3.141593" />
+    <origin xyz="0 0 0" />
   </joint>
 
   <joint name="horizontal_laser_link_joint" type="fixed">