diff --git a/hw/qdev-properties.c b/hw/qdev-properties.c
index 9e123ae8aa..277ff9e780 100644
--- a/hw/qdev-properties.c
+++ b/hw/qdev-properties.c
@@ -20,7 +20,7 @@ static void bit_prop_set(DeviceState *dev, Property *props, bool val)
     uint32_t *p = qdev_get_prop_ptr(dev, props);
     uint32_t mask = qdev_get_prop_mask(props);
     if (val)
-        *p |= ~mask;
+        *p |= mask;
     else
         *p &= ~mask;
 }