Index: /trunk/src/VBox/Devices/Storage/DevAHCI.cpp
===================================================================
--- /trunk/src/VBox/Devices/Storage/DevAHCI.cpp	(revision 55849)
+++ /trunk/src/VBox/Devices/Storage/DevAHCI.cpp	(revision 55850)
@@ -6916,5 +6916,5 @@
                 else
                 {
-                    ASMAtomicWritePtr(&pAhciPort->aActiveTasks[pAhciReq->uTag], NULL);
+                    ASMAtomicWriteNullPtr(&pAhciPort->aActiveTasks[pAhciReq->uTag]);
                     ahciR3ReqFree(pAhciPort, pAhciReq);
                 }
@@ -6931,5 +6931,5 @@
                 else
                 {
-                    ASMAtomicWritePtr(&pAhciPort->aActiveTasks[pAhciReq->uTag], NULL);
+                    ASMAtomicWriteNullPtr(&pAhciPort->aActiveTasks[pAhciReq->uTag]);
                     ahciR3ReqFree(pAhciPort, pAhciReq);
                 }