diff --git a/urdf/hc_sr04_sonar_example.xacro b/urdf/hc_sr04_sonar_example.xacro
index bf765628bcfc6ecac501ccc2748645c0352409cf..74424148e3b3ec3102fb91b02b1a402c958c653d 100644
--- a/urdf/hc_sr04_sonar_example.xacro
+++ b/urdf/hc_sr04_sonar_example.xacro
@@ -32,7 +32,7 @@
   </gazebo>
 
   <xacro:hcsr04_sonar name="hcsr04_sonar" parent="sonar_base_parent" sim_config="$(find iri_ranger1d_gazebo)/config/hc_sr04_sonar_ranger1d_sim_config.yaml">
-    <origin xyz="0.0 0.0 0.7" rpy="3.14159 0 0" />
+    <origin xyz="0.0 0.0 0.7" rpy="1.5707 0 0" />
   </xacro:hcsr04_sonar>
 
 </robot>