--- a/src/app/virtualbox/src/VBox/VMM/VMMAll/PGMAllGst.h
+++ b/src/app/virtualbox/src/VBox/VMM/VMMAll/PGMAllGst.h
@@ -101,9 +101,9 @@
         if (RT_FAILURE(rc))
             return PGM_GST_NAME(WalkReturnBadPhysAddr)(pVCpu, pWalk, 4, rc);
 
-        PX86PML4  register  pPml4 = pWalk->pPml4;
-        X86PML4E  register  Pml4e;
-        PX86PML4E register  pPml4e;
+        PX86PML4  pPml4 = pWalk->pPml4;
+        X86PML4E  Pml4e;
+        PX86PML4E pPml4e;
 
         pWalk->pPml4e  = pPml4e  = &pPml4->a[(GCPtr >> X86_PML4_SHIFT) & X86_PML4_MASK];
         pWalk->Pml4e.u = Pml4e.u = pPml4e->u;
@@ -127,9 +127,9 @@
     }
     {
 # if PGM_GST_TYPE == PGM_TYPE_AMD64 || PGM_GST_TYPE == PGM_TYPE_PAE
-        PX86PDPT register   pPdpt = pWalk->pPdpt;
-        PX86PDPE register   pPdpe;
-        X86PDPE  register   Pdpe;
+        PX86PDPT pPdpt = pWalk->pPdpt;
+        PX86PDPE pPdpe;
+        X86PDPE  Pdpe;
 
         pWalk->pPdpe  = pPdpe  = &pPdpt->a[(GCPtr >> GST_PDPT_SHIFT) & GST_PDPT_MASK];
         pWalk->Pdpe.u = Pdpe.u = pPdpe->u;
@@ -151,8 +151,8 @@
 # endif
     }
     {
-        PGSTPD  register    pPd = pWalk->pPd;
-        PGSTPDE register    pPde;
+        PGSTPD  pPd = pWalk->pPd;
+        PGSTPDE pPde;
         GSTPDE              Pde;
 
         pWalk->pPde  = pPde  = &pPd->a[(GCPtr >> GST_PD_SHIFT) & GST_PD_MASK];
@@ -201,9 +201,9 @@
             return PGM_GST_NAME(WalkReturnBadPhysAddr)(pVCpu, pWalk, 1, rc);
     }
     {
-        PGSTPT  register    pPt = pWalk->pPt;
-        PGSTPTE register    pPte;
-        GSTPTE  register    Pte;
+        PGSTPT  pPt = pWalk->pPt;
+        PGSTPTE pPte;
+        GSTPTE  Pte;
 
         pWalk->pPte  = pPte  = &pPt->a[(GCPtr >> GST_PT_SHIFT) & GST_PT_MASK];
         pWalk->Pte.u = Pte.u = pPte->u;
--- a/src/app/virtualbox/include/iprt/log.h
+++ b/src/app/virtualbox/include/iprt/log.h
@@ -607,7 +607,7 @@
 #  define _LogIt(a_fFlags, a_iGroup, ...) \
    do \
    { \
-        register PRTLOGGER LogIt_pLogger = RTLogDefaultInstanceEx(RT_MAKE_U32(a_fFlags, a_iGroup)); \
+        PRTLOGGER LogIt_pLogger = RTLogDefaultInstanceEx(RT_MAKE_U32(a_fFlags, a_iGroup)); \
         if (RT_LIKELY(!LogIt_pLogger)) \
         {   /* likely */ } \
         else \
@@ -621,7 +621,7 @@
 #  define LogIt(a_fFlags, a_iGroup, fmtargs) \
     do \
     { \
-        register PRTLOGGER LogIt_pLogger = RTLogDefaultInstanceEx(RT_MAKE_U32(a_fFlags, a_iGroup)); \
+        PRTLOGGER LogIt_pLogger = RTLogDefaultInstanceEx(RT_MAKE_U32(a_fFlags, a_iGroup)); \
         if (RT_LIKELY(!LogIt_pLogger)) \
         {   /* likely */ } \
         else \
@@ -632,7 +632,7 @@
 #  define LogItAlways(a_fFlags, a_iGroup, fmtargs) \
     do \
     { \
-        register PRTLOGGER LogIt_pLogger = RTLogDefaultInstanceEx(RT_MAKE_U32(0, UINT16_MAX)); \
+        PRTLOGGER LogIt_pLogger = RTLogDefaultInstanceEx(RT_MAKE_U32(0, UINT16_MAX)); \
         if (LogIt_pLogger) \
             LogIt_pLogger->pfnLogger fmtargs; \
     } while (0)
--- a/src/app/virtualbox/src/VBox/Devices/Network/DevPCNet.cpp
+++ b/src/app/virtualbox/src/VBox/Devices/Network/DevPCNet.cpp
@@ -1244,8 +1244,8 @@
  */
 static void pcnetUpdateIrq(PPCNETSTATE pThis)
 {
-    register int      iISR = 0;
-    register uint16_t csr0 = pThis->aCSR[0];
+    int      iISR = 0;
+    uint16_t csr0 = pThis->aCSR[0];
 
     csr0 &= ~0x0080; /* clear INTR */
 
--- a/src/app/virtualbox/src/VBox/Runtime/common/table/avl_Base.cpp.h
+++ b/src/app/virtualbox/src/VBox/Runtime/common/table/avl_Base.cpp.h
@@ -266,7 +266,7 @@
         }
         else
         {
-            register unsigned char uchHeight = (unsigned char)(KMAX(uchLeftHeight, uchRightHeight) + 1);
+            unsigned char uchHeight = (unsigned char)(KMAX(uchLeftHeight, uchRightHeight) + 1);
             if (uchHeight == pNode->uchHeight)
                 break;
             pNode->uchHeight = uchHeight;
@@ -300,10 +300,10 @@
 {
     KAVLSTACK               AVLStack;
     PPKAVLNODECORE          ppCurNode = ppTree;
-    register PKAVLNODECORE  pCurNode;
-    register KAVLKEY        Key = pNode->Key; NOREF(Key);
+    PKAVLNODECORE  pCurNode;
+    KAVLKEY        Key = pNode->Key; NOREF(Key);
 #ifdef KAVL_RANGE
-    register KAVLKEY        KeyLast = pNode->KeyLast; NOREF(KeyLast);
+    KAVLKEY        KeyLast = pNode->KeyLast; NOREF(KeyLast);
 #endif
 
     AVLStack.cEntries = 0;
@@ -400,7 +400,7 @@
 {
     KAVLSTACK                AVLStack;
     PPKAVLNODECORE           ppDeleteNode = ppTree;
-    register PKAVLNODECORE   pDeleteNode;
+    PKAVLNODECORE   pDeleteNode;
 
     AVLStack.cEntries = 0;
 
@@ -427,7 +427,7 @@
         /* find the rightmost node in the left tree. */
         const unsigned          iStackEntry = AVLStack.cEntries;
         PPKAVLNODECORE          ppLeftLeast = &pDeleteNode->pLeft;
-        register PKAVLNODECORE  pLeftLeast = KAVL_GET_POINTER(ppLeftLeast);
+        PKAVLNODECORE  pLeftLeast = KAVL_GET_POINTER(ppLeftLeast);
 
         while (pLeftLeast->pRight != KAVL_NULL)
         {
--- a/src/app/virtualbox/src/VBox/Runtime/common/string/utf-16.cpp
+++ b/src/app/virtualbox/src/VBox/Runtime/common/string/utf-16.cpp
@@ -193,7 +193,7 @@
 RT_EXPORT_SYMBOL(RTUtf16Len);
 
 
-RTDECL(int) RTUtf16Cmp(register PCRTUTF16 pwsz1, register PCRTUTF16 pwsz2)
+RTDECL(int) RTUtf16Cmp(PCRTUTF16 pwsz1, PCRTUTF16 pwsz2)
 {
     if (pwsz1 == pwsz2)
         return 0;
@@ -204,8 +204,8 @@
 
     for (;;)
     {
-        register RTUTF16  wcs = *pwsz1;
-        register int     iDiff = wcs - *pwsz2;
+        RTUTF16  wcs = *pwsz1;
+        int     iDiff = wcs - *pwsz2;
         if (iDiff || !wcs)
             return iDiff;
         pwsz1++;