diff --git a/dlls/oleaut32/olepicture.c b/dlls/oleaut32/olepicture.c
index dfaf6f4f160..5d0d801d39b 100644
--- a/dlls/oleaut32/olepicture.c
+++ b/dlls/oleaut32/olepicture.c
@@ -48,7 +48,6 @@
 
 #define COBJMACROS
 #define NONAMELESSUNION
-#define NONAMELESSSTRUCT
 
 #include "winerror.h"
 #include "windef.h"
diff --git a/dlls/oleaut32/olepropframe.c b/dlls/oleaut32/olepropframe.c
index 9a563f15223..b89d3a69458 100644
--- a/dlls/oleaut32/olepropframe.c
+++ b/dlls/oleaut32/olepropframe.c
@@ -23,7 +23,6 @@
 
 #define COBJMACROS
 #define NONAMELESSUNION
-#define NONAMELESSSTRUCT
 
 #include "windef.h"
 #include "winbase.h"
diff --git a/dlls/oleaut32/recinfo.c b/dlls/oleaut32/recinfo.c
index be61fd52985..f60fb8af4f2 100644
--- a/dlls/oleaut32/recinfo.c
+++ b/dlls/oleaut32/recinfo.c
@@ -20,7 +20,6 @@
 
 #define COBJMACROS
 #define NONAMELESSUNION
-#define NONAMELESSSTRUCT
 
 #include "windef.h"
 #include "winbase.h"
diff --git a/dlls/oleaut32/tmarshal.c b/dlls/oleaut32/tmarshal.c
index 89dc8941d8f..7bf62b7a0d8 100644
--- a/dlls/oleaut32/tmarshal.c
+++ b/dlls/oleaut32/tmarshal.c
@@ -33,7 +33,6 @@
 
 #define COBJMACROS
 #define NONAMELESSUNION
-#define NONAMELESSSTRUCT
 
 #include "winerror.h"
 #include "windef.h"
diff --git a/dlls/oleaut32/typelib.c b/dlls/oleaut32/typelib.c
index c6c539eb558..54dbc0554b8 100644
--- a/dlls/oleaut32/typelib.c
+++ b/dlls/oleaut32/typelib.c
@@ -58,7 +58,6 @@
 
 #define COBJMACROS
 #define NONAMELESSUNION
-#define NONAMELESSSTRUCT
 
 #include "winerror.h"
 #include "windef.h"
diff --git a/dlls/oleaut32/usrmarshal.c b/dlls/oleaut32/usrmarshal.c
index 108f819f9f3..3187ca20cf1 100644
--- a/dlls/oleaut32/usrmarshal.c
+++ b/dlls/oleaut32/usrmarshal.c
@@ -24,7 +24,6 @@
 
 #define COBJMACROS
 #define NONAMELESSUNION
-#define NONAMELESSSTRUCT
 
 #include "windef.h"
 #include "winbase.h"
diff --git a/dlls/oleaut32/varformat.c b/dlls/oleaut32/varformat.c
index 27bedceaf5c..5d220fa382d 100644
--- a/dlls/oleaut32/varformat.c
+++ b/dlls/oleaut32/varformat.c
@@ -32,8 +32,6 @@
 #include <stdarg.h>
 #include <stdio.h>
 
-#define NONAMELESSUNION
-#define NONAMELESSSTRUCT
 #include "windef.h"
 #include "winbase.h"
 #include "wine/unicode.h"
diff --git a/dlls/oleaut32/variant.h b/dlls/oleaut32/variant.h
index 1e75bd8bd37..e5d9a56aea7 100644
--- a/dlls/oleaut32/variant.h
+++ b/dlls/oleaut32/variant.h
@@ -17,8 +17,7 @@
  * License along with this library; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  */
-#define NONAMELESSUNION
-#define NONAMELESSSTRUCT
+
 #include "windef.h"
 #include "winerror.h"
 #include "objbase.h"