Index: /trunk/src/VBox/Devices/Storage/DevBusLogic.cpp
===================================================================
--- /trunk/src/VBox/Devices/Storage/DevBusLogic.cpp	(revision 76076)
+++ /trunk/src/VBox/Devices/Storage/DevBusLogic.cpp	(revision 76077)
@@ -350,9 +350,10 @@
     /** Whether RC is enabled. */
     bool                            fGCEnabled;
-
     /** Base address of the I/O ports. */
     RTIOPORT                        IOPortBase;
+
     /** Base address of the memory mapping. */
     RTGCPHYS                        MMIOBase;
+
     /** Status register - Readonly. */
     volatile uint8_t                regStatus;
@@ -407,10 +408,14 @@
     uint8_t                         uDevType;
 
+    /** Signature index for Adaptec models. */
+    uint8_t                         uAhaSigIdx;
+    uint8_t                         Alignment[7];
+
     /** Number of mailboxes the guest set up. */
     uint32_t                        cMailbox;
 
-    /** Signature index for Adaptec models. */
-    uint8_t                         uAhaSigIdx;
-    uint8_t                         Alignment0[7];
+#if HC_ARCH_BITS == 64
+    uint32_t                        Alignment0;
+#endif
 
     /** Time when HBA reset was last initiated. */  /**< @todo does this need to be saved? */