diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c
index b82620cefa68..465889a4af60 100644
--- a/arch/s390/kvm/vsie.c
+++ b/arch/s390/kvm/vsie.c
@@ -149,6 +149,7 @@ static int setup_apcb10(struct kvm_vcpu *vcpu, struct kvm_s390_apcb1 *apcb_s,
 			    sizeof(struct kvm_s390_apcb0)))
 		return -EFAULT;
 
+	memset(apcb_s, 0, sizeof(*apcb_s));
 	apcb_s->apm[0] = apcb_h->apm[0] & tmp.apm[0];
 	apcb_s->aqm[0] = apcb_h->aqm[0] & tmp.aqm[0] & 0xffff000000000000UL;
 	apcb_s->adm[0] = apcb_h->adm[0] & tmp.adm[0] & 0xffff000000000000UL;