diff --git a/esphome/config_validation.py b/esphome/config_validation.py
index cf0b1d3aca..3720757828 100644
--- a/esphome/config_validation.py
+++ b/esphome/config_validation.py
@@ -125,6 +125,7 @@ RESERVED_IDS = [
     "char16_t",
     "char32_t",
     "class",
+    "clock",
     "compl",
     "concept",
     "const",