diff --git a/urdf/diffbot_description.urdf.xacro b/urdf/diffbot_description.urdf.xacro
index 0cf12ce..01dc898 100644
--- a/urdf/diffbot_description.urdf.xacro
+++ b/urdf/diffbot_description.urdf.xacro
@@ -71,7 +71,7 @@
       <origin xyz="6.9388939039072283776e-17 -0.125 -0.05999999999999999778" rpy="-1.57079632679489678 -1.1660544913393859426e-16 6.9388939039072283776e-17" />
       <parent link="${prefix}base_link" />
       <child link="${prefix}right_wheel" />
-      <axis xyz="0 0 1"/>
+      <axis xyz="0 0 -1"/>
       <limit effort="1" velocity="20" />
       <joint_properties friction="0.0"/>
     </joint>
@@ -106,7 +106,7 @@
       <origin xyz="-5.5511151231257827021e-17 0.12500000000000005551 -0.060000000000000011657" rpy="1.570796326794896558 -1.6964751660994284333e-16 1.7347234759768063549e-16" />
       <parent link="${prefix}base_link" />
       <child link="${prefix}left_wheel" />
-      <axis xyz="0 0 1" />
+      <axis xyz="0 0 -1" />
       <limit effort="1" velocity="20" />
       <joint_properties friction="0.0" />
     </joint>