diff --git a/dlls/mscoree/assembly.c b/dlls/mscoree/assembly.c
index 4af6f281771..b6535561ca0 100644
--- a/dlls/mscoree/assembly.c
+++ b/dlls/mscoree/assembly.c
@@ -18,6 +18,8 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  */
 
+#define NONAMELESSUNION
+
 #include <stdarg.h>
 #include <stdio.h>
 
@@ -319,7 +321,7 @@ HRESULT assembly_get_native_entrypoint(ASSEMBLY *assembly, NativeEntryPointFunc
 {
     if (assembly->corhdr->Flags & COMIMAGE_FLAGS_NATIVE_ENTRYPOINT)
     {
-        *func = assembly_rva_to_va(assembly, assembly->corhdr->EntryPointRVA);
+        *func = assembly_rva_to_va(assembly, assembly->corhdr->u.EntryPointRVA);
         return S_OK;
     }
     else