diff --git a/esphome/components/http_request/__init__.py b/esphome/components/http_request/__init__.py
index 146458f53b..4884085099 100644
--- a/esphome/components/http_request/__init__.py
+++ b/esphome/components/http_request/__init__.py
@@ -194,7 +194,7 @@ async def to_code(config):
             cg.add_define("CPPHTTPLIB_OPENSSL_SUPPORT")
         elif path := config.get(CONF_CA_CERTIFICATE_PATH):
             cg.add_define("CPPHTTPLIB_OPENSSL_SUPPORT")
-            cg.add(var.set_ca_path(path))
+            cg.add(var.set_ca_path(str(path)))
             cg.add_build_flag("-lssl")
             cg.add_build_flag("-lcrypto")