diff --git a/esphome/config_validation.py b/esphome/config_validation.py
index 4ec3033452..b98a56c4b9 100644
--- a/esphome/config_validation.py
+++ b/esphome/config_validation.py
@@ -1191,6 +1191,8 @@ def validate_registry_entry(name, registry):
 
         registry_entry = registry[key]
 
+        value = value.copy()
+
         with prepend_path([key]):
             value[key] = registry_entry.schema(value[key])