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-rw-r--r--hw/core/qdev-clock.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/hw/core/qdev-clock.c b/hw/core/qdev-clock.c
index f139b68b88..47ecb5b4fa 100644
--- a/hw/core/qdev-clock.c
+++ b/hw/core/qdev-clock.c
@@ -186,5 +186,6 @@ Clock *qdev_alias_clock(DeviceState *dev, const char *name,
 
 void qdev_connect_clock_in(DeviceState *dev, const char *name, Clock *source)
 {
+    assert(!dev->realized);
     clock_set_source(qdev_get_clock_in(dev, name), source);
 }