diff --git a/tests/libsercomstub.c b/tests/libsercomstub.c
new file mode 100644
index 0000000..99662d0
--- /dev/null
+++ b/tests/libsercomstub.c
@@ -0,0 +1,3 @@
+/* Stubs for embedded build */
+void sercomm_drv_lock(unsigned long __attribute__((unused)) *flags) {}
+void sercomm_drv_unlock(unsigned long __attribute__((unused)) *flags) {}