diff --git a/port/esp32/components/btstack/CMakeLists.txt b/port/esp32/components/btstack/CMakeLists.txt
index 49cb77b55..51ed91adb 100644
--- a/port/esp32/components/btstack/CMakeLists.txt
+++ b/port/esp32/components/btstack/CMakeLists.txt
@@ -22,6 +22,7 @@ set(COMPONENT_SRCDIRS "3rd-party/bluedroid/decoder/srce"
                       "3rd-party/hxcmod-player/mods"
                       "../lwip/lwip/src/apps/http"
                       "3rd-party/md5"
+                      "3rd-party/yxml"
                       "3rd-party/micro-ecc"
                       "3rd-party/lwip/dhcp-server"
                       "src/ble/gatt-service"