diff --git a/dlls/dx8vb/main.c b/dlls/dx8vb/main.c
index aa6b9436ceb..a1ee7c918e6 100644
--- a/dlls/dx8vb/main.c
+++ b/dlls/dx8vb/main.c
@@ -157,13 +157,13 @@ HRESULT WINAPI DllGetClassObject(REFCLSID rclsid, REFIID riid, void **ppv)
          && !IsEqualGUID( &IID_IUnknown, riid))
         return E_NOINTERFACE;
 
-    for (i = 0; i < sizeof(object_creation)/sizeof(object_creation[0]); i++)
+    for (i = 0; i < ARRAY_SIZE(object_creation); i++)
     {
         if (IsEqualGUID(object_creation[i].clsid, rclsid))
             break;
     }
 
-    if (i == sizeof(object_creation)/sizeof(object_creation[0]))
+    if (i == ARRAY_SIZE(object_creation))
     {
         FIXME("%s: no class found.\n", debugstr_guid(rclsid));
         return CLASS_E_CLASSNOTAVAILABLE;