diff --git a/esphome/components/optolink/helpers.h b/esphome/components/optolink/helpers.h
index cb46ea44d9..15eb8e84d7 100644
--- a/esphome/components/optolink/helpers.h
+++ b/esphome/components/optolink/helpers.h
@@ -1,3 +1,5 @@
+#pragma once
+
 #ifdef USE_ARDUINO
 
 #include <cstdint>