diff --git a/esphome/components/json/json_util.h b/esphome/components/json/json_util.h
index 57fe6107d8..2299a4cfed 100644
--- a/esphome/components/json/json_util.h
+++ b/esphome/components/json/json_util.h
@@ -4,9 +4,10 @@
 
 #include "esphome/core/helpers.h"
 
-#undef ARDUINOJSON_ENABLE_STD_STRING
 #define ARDUINOJSON_ENABLE_STD_STRING 1  // NOLINT
 
+#define ARDUINOJSON_USE_LONG_LONG 1  // NOLINT
+
 #include <ArduinoJson.h>
 
 namespace esphome {