diff --git a/CMakeLists.txt b/CMakeLists.txt
index 83bf9ec..52ca50b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -80,7 +80,11 @@ endif()
 set(USB_ITF_HID 1)
 include(pico-keys-sdk/pico_keys_sdk_import.cmake)
 
-set(SOURCES ${PICO_KEYS_SOURCES}
+if(NOT ESP_PLATFORM)
+    set(SOURCES ${PICO_KEYS_SOURCES})
+endif()
+
+set(SOURCES ${SOURCES}
         ${CMAKE_CURRENT_LIST_DIR}/src/fido/fido.c
         ${CMAKE_CURRENT_LIST_DIR}/src/fido/files.c
         ${CMAKE_CURRENT_LIST_DIR}/src/fido/kek.c