diff --git a/hw/s390x/event-facility.c b/hw/s390x/event-facility.c
index 0777a939165ed865250547e428ad4108565b10f3..2e9e62fe1f198ad0f15ff277eb9a09311a74c923 100644
--- a/hw/s390x/event-facility.c
+++ b/hw/s390x/event-facility.c
@@ -32,7 +32,7 @@ struct SCLPEventFacility {
     unsigned int receive_mask;
 };
 
-SCLPEvent cpu_hotplug;
+static SCLPEvent cpu_hotplug;
 
 /* return true if any child has event pending set */
 static bool event_pending(SCLPEventFacility *ef)