diff --git a/pico_hsm_sdk_import.cmake b/pico_hsm_sdk_import.cmake
index 1e54ee9..a2f9b3a 100644
--- a/pico_hsm_sdk_import.cmake
+++ b/pico_hsm_sdk_import.cmake
@@ -101,6 +101,8 @@ if (NOT TARGET pico_hsm_sdk)
                 ${CMAKE_CURRENT_LIST_DIR}/mbedtls/library/pkwrite.c
                 ${CMAKE_CURRENT_LIST_DIR}/mbedtls/library/pkwrite.c
                 ${CMAKE_CURRENT_LIST_DIR}/mbedtls/library/chachapoly.c
+                ${CMAKE_CURRENT_LIST_DIR}/mbedtls/library/chacha20.c
+                ${CMAKE_CURRENT_LIST_DIR}/mbedtls/library/poly1305.c
                 )
         target_include_directories(pico_hsm_sdk INTERFACE
                 ${CMAKE_CURRENT_LIST_DIR}/src/usb/hid