diff --git a/src/common/util/spin_lock.h b/src/common/util/spin_lock.h
index 3b16d5c..93695b1 100644
--- a/src/common/util/spin_lock.h
+++ b/src/common/util/spin_lock.h
@@ -10,6 +10,8 @@ typedef struct {
 	volatile atomic_flag flag;
 } SpinLock;
 
+#define SPIN_LOCK_UNLOCKED (SpinLock) { .flag = ATOMIC_FLAG_INIT }
+
 HEADER_FN bool
 spin_lock_try_acquire(SpinLock *lock)
 {