diff --git a/dlls/windowscodecs/proxy.c b/dlls/windowscodecs/proxy.c
index 38f076fa1d3..10d34e3d3c9 100644
--- a/dlls/windowscodecs/proxy.c
+++ b/dlls/windowscodecs/proxy.c
@@ -23,7 +23,6 @@
 #include <stdarg.h>
 
 #define COBJMACROS
-#define NONAMELESSUNION
 
 #include "windef.h"
 #include "winbase.h"
diff --git a/dlls/windowscodecs/regsvr.c b/dlls/windowscodecs/regsvr.c
index 91df294572f..28469c7541e 100644
--- a/dlls/windowscodecs/regsvr.c
+++ b/dlls/windowscodecs/regsvr.c
@@ -16,8 +16,6 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  */
 
-#define NONAMELESSUNION
-#define NONAMELESSSTRUCT
 #define COBJMACROS
 #include <stdarg.h>
 #include <string.h>