diff --git a/include/nuttx/spinlock.h b/include/nuttx/spinlock.h
index 7d9608d26cf..c1013e64015 100644
--- a/include/nuttx/spinlock.h
+++ b/include/nuttx/spinlock.h
@@ -448,6 +448,8 @@ static inline_function void spin_unlock(FAR volatile spinlock_t *lock)
 #  else
 #    define spin_unlock(l)  do { *(l) = SP_UNLOCKED; } while (0)
 #  endif
+#else
+#  define spin_unlock(lock)
 #endif /* CONFIG_SPINLOCK */
 
 /****************************************************************************