diff --git a/dlls/oledb32/convert.c b/dlls/oledb32/convert.c
index 36448d31e64..11d153c0a81 100644
--- a/dlls/oledb32/convert.c
+++ b/dlls/oledb32/convert.c
@@ -20,8 +20,6 @@
 #include <stdarg.h>
 
 #define COBJMACROS
-#define NONAMELESSUNION
-#define NONAMELESSSTRUCT
 
 #include "windef.h"
 #include "winbase.h"
diff --git a/dlls/oledb32/datainit.c b/dlls/oledb32/datainit.c
index dfafeb1434d..3cd38213c04 100644
--- a/dlls/oledb32/datainit.c
+++ b/dlls/oledb32/datainit.c
@@ -18,8 +18,6 @@
 #include <stdarg.h>
 
 #define COBJMACROS
-#define NONAMELESSUNION
-#define NONAMELESSSTRUCT
 
 #include "windef.h"
 #include "winbase.h"
diff --git a/dlls/oledb32/main.c b/dlls/oledb32/main.c
index 48aa5a3311b..f28e57a3f3a 100644
--- a/dlls/oledb32/main.c
+++ b/dlls/oledb32/main.c
@@ -20,8 +20,6 @@
 #include <stdarg.h>
 
 #define COBJMACROS
-#define NONAMELESSUNION
-#define NONAMELESSSTRUCT
 
 #include "windef.h"
 #include "winbase.h"