diff --git a/base_c/src/mutex.c b/base_c/src/mutex.c
index 2bd54af..7e29b43 100644
--- a/base_c/src/mutex.c
+++ b/base_c/src/mutex.c
@@ -164,4 +164,5 @@ int embb_spin_unlock(embb_spinlock_t* spinlock) {
 void embb_spin_destroy(embb_spinlock_t* spinlock) {
   // for now, doing nothing here... in future, will call the respective
   // destroy function for atomics...
+  EMBB_UNUSED(spinlock);
 }