diff --git a/dlls/oleaut32/tests/typelib.c b/dlls/oleaut32/tests/typelib.c
index 6d476143ad6..c6539eb6031 100644
--- a/dlls/oleaut32/tests/typelib.c
+++ b/dlls/oleaut32/tests/typelib.c
@@ -1373,7 +1373,8 @@ static void test_CreateTypeLib(void) {
     ok(typeattr->cFuncs == 1, "cFuncs = %d\n", typeattr->cFuncs);
     ok(typeattr->cVars == 0, "cVars = %d\n", typeattr->cVars);
     ok(typeattr->cImplTypes == 1, "cImplTypes = %d\n", typeattr->cImplTypes);
-    ok(typeattr->cbSizeVft == 32, "cbSizeVft = %d\n", typeattr->cbSizeVft);
+    ok(typeattr->cbSizeVft == 32 || broken(typeattr->cbSizeVft == 7 * sizeof(void *) + 4), /* xp64 */
+       "cbSizeVft = %d\n", typeattr->cbSizeVft);
     ok(typeattr->cbAlignment == 4, "cbAlignment = %d\n", typeattr->cbAlignment);
     ok(typeattr->wTypeFlags == (TYPEFLAG_FDISPATCHABLE|TYPEFLAG_FDUAL), "wTypeFlags = %d\n", typeattr->wTypeFlags);
     ok(typeattr->wMajorVerNum == 0, "wMajorVerNum = %d\n", typeattr->wMajorVerNum);
@@ -1395,7 +1396,7 @@ static void test_CreateTypeLib(void) {
     ok(typeattr->cFuncs == 8, "cFuncs = %d\n", typeattr->cFuncs);
     ok(typeattr->cVars == 0, "cVars = %d\n", typeattr->cVars);
     ok(typeattr->cImplTypes == 1, "cImplTypes = %d\n", typeattr->cImplTypes);
-    ok(typeattr->cbSizeVft == 28, "cbSizeVft = %d\n", typeattr->cbSizeVft);
+    ok(typeattr->cbSizeVft == 7 * sizeof(void *), "cbSizeVft = %d\n", typeattr->cbSizeVft);
     ok(typeattr->cbAlignment == 4, "cbAlignment = %d\n", typeattr->cbAlignment);
     ok(typeattr->wTypeFlags == (TYPEFLAG_FDISPATCHABLE|TYPEFLAG_FDUAL), "wTypeFlags = %d\n", typeattr->wTypeFlags);
     ok(typeattr->wMajorVerNum == 0, "wMajorVerNum = %d\n", typeattr->wMajorVerNum);
@@ -1414,7 +1415,8 @@ static void test_CreateTypeLib(void) {
     ok(typeattr->cFuncs == 11, "cFuncs = %d\n", typeattr->cFuncs);
     ok(typeattr->cVars == 0, "cVars = %d\n", typeattr->cVars);
     ok(typeattr->cImplTypes == 1, "cImplTypes = %d\n", typeattr->cImplTypes);
-    ok(typeattr->cbSizeVft == 56, "cbSizeVft = %d\n", typeattr->cbSizeVft);
+    ok(typeattr->cbSizeVft == 56 || broken(typeattr->cbSizeVft == 3 * sizeof(void *) + 44), /* xp64 */
+       "cbSizeVft = %d\n", typeattr->cbSizeVft);
     ok(typeattr->cbAlignment == 4, "cbAlignment = %d\n", typeattr->cbAlignment);
     ok(typeattr->wTypeFlags == 0, "wTypeFlags = %d\n", typeattr->wTypeFlags);
     ok(typeattr->wMajorVerNum == 0, "wMajorVerNum = %d\n", typeattr->wMajorVerNum);
diff --git a/dlls/oleaut32/typelib2.c b/dlls/oleaut32/typelib2.c
index 6b1aea062ba..a93e5a4962a 100644
--- a/dlls/oleaut32/typelib2.c
+++ b/dlls/oleaut32/typelib2.c
@@ -2456,7 +2456,7 @@ static HRESULT WINAPI ICreateTypeInfo2_fnLayOut(
             return hres;
         }
 
-        This->typeinfo->cbSizeVft = typeattr->cbSizeVft;
+        This->typeinfo->cbSizeVft = typeattr->cbSizeVft * 4 / sizeof(void *);
 
         ITypeInfo_ReleaseTypeAttr(inherited, typeattr);
         ITypeInfo_Release(inherited);
@@ -2928,7 +2928,7 @@ static HRESULT WINAPI ITypeInfo2_fnGetTypeAttr(
         (*ppTypeAttr)->cFuncs += 7;
     (*ppTypeAttr)->cVars = This->typeinfo->cElement>>16;
     (*ppTypeAttr)->cImplTypes = This->typeinfo->cImplTypes;
-    (*ppTypeAttr)->cbSizeVft = This->typekind==TKIND_DISPATCH ? 28 : This->typeinfo->cbSizeVft;
+    (*ppTypeAttr)->cbSizeVft = This->typekind==TKIND_DISPATCH ? 7 * sizeof(void*) : This->typeinfo->cbSizeVft;
     (*ppTypeAttr)->cbAlignment = (This->typeinfo->typekind>>11) & 0x1f;
     (*ppTypeAttr)->wTypeFlags = This->typeinfo->flags;
     (*ppTypeAttr)->wMajorVerNum = This->typeinfo->version&0xffff;