diff --git a/examples/worlds/pendulum_links.sdf b/examples/worlds/pendulum_links.sdf
index 2f62bab25c..1927835b7a 100644
--- a/examples/worlds/pendulum_links.sdf
+++ b/examples/worlds/pendulum_links.sdf
@@ -9,7 +9,6 @@
 
 -->
 
-<?xml version="1.0" ?>
 <sdf version="1.7">
   <world name="double_pendulum">
     <physics name="1ms" type="ignored">