diff --git a/esphome/components/http_request/http_request.h b/esphome/components/http_request/http_request.h
index afa3336f8ee..b44f449e304 100644
--- a/esphome/components/http_request/http_request.h
+++ b/esphome/components/http_request/http_request.h
@@ -409,7 +409,7 @@ template<typename... Ts> class HttpRequestSendAction : public Action<Ts...> {
     this->request_headers_.insert({key, value});
   }
 
-  void add_collect_header(const char *value) { this->collect_headers_.push_back(str_lower_case(value)); }
+  void add_collect_header(const char *value) { this->collect_headers_.push_back(value); }
 
   void add_json(const char *key, TemplatableValue<std::string, Ts...> value) { this->json_.insert({key, value}); }