diff --git a/model/humanoid/humanoid.xml b/model/humanoid/humanoid.xml
index 3f2f7436..31cde3ed 100644
--- a/model/humanoid/humanoid.xml
+++ b/model/humanoid/humanoid.xml
@@ -37,7 +37,7 @@
     <default class="body">
 
       <!-- geoms -->
-      <geom type="capsule" condim="1" friction=".7" solimp=".9 .99 .003" solref=".015 1" material="body"/>
+      <geom type="capsule" condim="1" friction=".7" solimp=".9 .99 .003" solref=".015 1" material="body" group="1"/>
       <default class="thigh">
         <geom size=".06"/>
       </default>