diff --git a/src/meshcat/commands.py b/src/meshcat/commands.py
index a8ddcf6..7ece1e1 100644
--- a/src/meshcat/commands.py
+++ b/src/meshcat/commands.py
@@ -98,7 +98,7 @@ def lower(self):
         return {
             u"type": u"set_property",
             u"path": self.path.lower(),
-            u"property": self.key.lower(),
+            u"property": self.key,
             u"value": self.value
         }