diff --git a/src/runtime/kwalletd/backend/blowfish.cc b/src/runtime/kwalletd/backend/blowfish.cc
--- a/src/runtime/kwalletd/backend/blowfish.cc
+++ b/src/runtime/kwalletd/backend/blowfish.cc
@@ -35,8 +35,9 @@
 // We need to live with -Wundef until someone really figures out the problem.
 //#include <QtCore/qglobal.h> // for Q_BYTE_ORDER and friends
 // Workaround for -Wundef
-#define Q_BIG_ENDIAN 1
-#define Q_BYTE_ORDER Q_BIG_ENDIAN
+#include <sys/types.h>
+#define Q_BIG_ENDIAN __BIG_ENDIAN
+#define Q_BYTE_ORDER __BYTE_ORDER
 
 BlowFish::BlowFish()
 {
diff --git a/src/runtime/kwalletd/backend/sha1.cc b/src/runtime/kwalletd/backend/sha1.cc
--- a/src/runtime/kwalletd/backend/sha1.cc
+++ b/src/runtime/kwalletd/backend/sha1.cc
@@ -26,10 +26,10 @@
 // We need to live with -Wundef until someone really figures out the problem.
 //#include <QtCore/qglobal.h> // for Q_BYTE_ORDER and friends
 // Workaround for -Wundef
-#define Q_BIG_ENDIAN 1
-#define Q_BYTE_ORDER Q_BIG_ENDIAN
-
 #include <sys/types.h>
+#define Q_BIG_ENDIAN __BIG_ENDIAN
+#define Q_BYTE_ORDER __BYTE_ORDER
+
 #ifdef HAVE_SYS_BITYPES_H
 #include <sys/bitypes.h> /* For uintXX_t on Tru64 */
 #endif