diff --git a/tools/machine-learning/mujoco/model/nao.xml b/tools/machine-learning/mujoco/model/nao.xml
index cbad454c11..dafaef14c7 100644
--- a/tools/machine-learning/mujoco/model/nao.xml
+++ b/tools/machine-learning/mujoco/model/nao.xml
@@ -155,6 +155,16 @@
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