diff --git a/hw/ide/qdev.c b/hw/ide/qdev.c
index 18c4b7e..6e475e6 100644
--- a/hw/ide/qdev.c
+++ b/hw/ide/qdev.c
@@ -206,7 +206,7 @@
 #define DEFINE_IDE_DEV_PROPERTIES()                     \
     DEFINE_BLOCK_PROPERTIES(IDEDrive, dev.conf),        \
     DEFINE_PROP_STRING("ver",  IDEDrive, dev.version),  \
-    DEFINE_PROP_HEX64("wwn",  IDEDrive, dev.wwn, 0),    \
+    DEFINE_PROP_UINT64("wwn",  IDEDrive, dev.wwn, 0),    \
     DEFINE_PROP_STRING("serial",  IDEDrive, dev.serial),\
     DEFINE_PROP_STRING("model", IDEDrive, dev.model)