diff --git a/dlls/dbghelp/dwarf.c b/dlls/dbghelp/dwarf.c
index 81f3c7f420b..8965f7f47f2 100644
--- a/dlls/dbghelp/dwarf.c
+++ b/dlls/dbghelp/dwarf.c
@@ -19,6 +19,8 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  */
 
+#define NONAMELESSUNION
+
 #include "config.h"
 
 #include <sys/types.h>
diff --git a/dlls/dbghelp/type.c b/dlls/dbghelp/type.c
index 7978a1c5590..aeb3e75ae6f 100644
--- a/dlls/dbghelp/type.c
+++ b/dlls/dbghelp/type.c
@@ -21,6 +21,9 @@
  * Note: This really doesn't do much at the moment, but it forms the framework
  * upon which full support for datatype handling will eventually be built.
  */
+
+#define NONAMELESSUNION
+
 #include "config.h"
 #include <stdlib.h>
 #include <stdarg.h>