diff --git a/pico_hsm_sdk_import.cmake b/pico_hsm_sdk_import.cmake
index 15c5691..58c5b6c 100644
--- a/pico_hsm_sdk_import.cmake
+++ b/pico_hsm_sdk_import.cmake
@@ -140,6 +140,7 @@ if (ENABLE_EMULATION)
     ${CMAKE_CURRENT_LIST_DIR}/mbedtls/library/ctr_drbg.c
     ${CMAKE_CURRENT_LIST_DIR}/mbedtls/library/entropy.c
     ${CMAKE_CURRENT_LIST_DIR}/mbedtls/library/entropy_poll.c
+    ${CMAKE_CURRENT_LIST_DIR}/mbedtls/library/aesni.c
     )
     set(INCLUDES ${INCLUDES}
     ${CMAKE_CURRENT_LIST_DIR}/src/usb/emulation