diff --git a/src/system/libroot/os/arch/arm/atomic.S b/src/system/libroot/os/arch/arm/atomic.S
index 56bddd9875..31068b2802 100644
--- a/src/system/libroot/os/arch/arm/atomic.S
+++ b/src/system/libroot/os/arch/arm/atomic.S
@@ -88,6 +88,13 @@ FUNCTION(atomic_get):
         bx	lr
 FUNCTION_END(atomic_get)
 
+/* void __sync_synchronize(void)
+ */
+FUNCTION(__sync_synchronize):
+	dmb
+	bx lr
+FUNCTION_END(__sync_synchronize)
+
 #endif /* ATOMIC_FUNCS_ARE_SYSCALLS */
 
 #ifndef ATOMIC64_FUNCS_ARE_SYSCALLS