Index: /trunk/src/VBox/Devices/PC/DevIoApic.cpp
===================================================================
--- /trunk/src/VBox/Devices/PC/DevIoApic.cpp	(revision 40943)
+++ /trunk/src/VBox/Devices/PC/DevIoApic.cpp	(revision 40944)
@@ -159,6 +159,6 @@
                 else
                     vector = entry & 0xff;
-                uint32_t uTagSrc = pThis->auTagSrc[vector];
-                pThis->auTagSrc[vector] = 0;
+                uint32_t uTagSrc = pThis->auTagSrc[i];
+                pThis->auTagSrc[i] = 0;
 
                 int rc = pThis->CTX_SUFF(pIoApicHlp)->pfnApicBusDeliver(pThis->CTX_SUFF(pDevIns),