diff --git a/target-s390x/kvm.c b/target-s390x/kvm.c
index 690cb7198a..d247471119 100644
--- a/target-s390x/kvm.c
+++ b/target-s390x/kvm.c
@@ -1272,7 +1272,7 @@ void kvm_s390_crw_mchk(void)
     struct kvm_s390_irq irq = {
         .type = KVM_S390_MCHK,
         .u.mchk.cr14 = 1 << 28,
-        .u.mchk.mcic = 0x00400f1d40330000,
+        .u.mchk.mcic = 0x00400f1d40330000ULL,
     };
     kvm_s390_floating_interrupt(&irq);
 }