diff --git a/include/winnt.h b/include/winnt.h
index 96ae5ed..9aba207 100644
--- a/include/winnt.h
+++ b/include/winnt.h
@@ -27,6 +27,21 @@
 
 /**** Some Wine specific definitions *****/
 
+/* Architecture dependent settings. */
+/* These are hardcoded to avoid dependencies on config.h in Winelib apps. */
+#if defined(__i386__)
+# undef  WORDS_BIGENDIAN
+# undef  BITFIELDS_BIGENDIAN
+# define ALLOW_UNALIGNED_ACCESS
+#elif defined(__sparc__)
+# define WORDS_BIGENDIAN
+# define BITFIELDS_BIGENDIAN
+# undef  ALLOW_UNALIGNED_ACCESS
+#elif !defined(RC_INVOKED)
+# error Unknown CPU architecture!
+#endif
+
+
 /* Calling conventions definitions */
 
 #ifdef __i386__