Index: /trunk/src/VBox/Runtime/common/alloc/memtracker.cpp
===================================================================
--- /trunk/src/VBox/Runtime/common/alloc/memtracker.cpp	(revision 36673)
+++ /trunk/src/VBox/Runtime/common/alloc/memtracker.cpp	(revision 36674)
@@ -156,6 +156,7 @@
     /** List of RTMEMTRACKERTAG records. */
     RTLISTNODE          TagList;
-#ifdef RT_ARCH_X86
-    uint32_t            dummy;
+#if ARCH_BITS == 32
+    /** Alignment padding. */
+    uint32_t            u32Alignment;
 #endif
     /** The global user record (fallback). */