diff --git a/hw/qdev.c b/hw/qdev.c
index a8de27841b..9ed6f85cc4 100644
--- a/hw/qdev.c
+++ b/hw/qdev.c
@@ -33,7 +33,7 @@
 struct DeviceProperty {
     const char *name;
     union {
-        int i;
+        uint64_t i;
         void *ptr;
     } value;
     DeviceProperty *next;
@@ -120,7 +120,7 @@ static DeviceProperty *create_prop(DeviceState *dev, const char *name)
     return prop;
 }
 
-void qdev_set_prop_int(DeviceState *dev, const char *name, int value)
+void qdev_set_prop_int(DeviceState *dev, const char *name, uint64_t value)
 {
     DeviceProperty *prop;
 
diff --git a/hw/qdev.h b/hw/qdev.h
index 210062a0af..5a34f51038 100644
--- a/hw/qdev.h
+++ b/hw/qdev.h
@@ -33,7 +33,7 @@ DeviceState *qdev_create(void *bus, const char *name);
 void qdev_init(DeviceState *dev);
 
 /* Set properties between creation and init.  */
-void qdev_set_prop_int(DeviceState *dev, const char *name, int value);
+void qdev_set_prop_int(DeviceState *dev, const char *name, uint64_t value);
 void qdev_set_prop_ptr(DeviceState *dev, const char *name, void *value);
 void qdev_set_netdev(DeviceState *dev, NICInfo *nd);