diff --git a/target-s390x/kvm.c b/target-s390x/kvm.c
index ec64b7e..6c4360b 100644
--- a/target-s390x/kvm.c
+++ b/target-s390x/kvm.c
@@ -187,6 +187,9 @@
         || !kvm_check_extension(s, KVM_CAP_S390_COW)) {
         phys_mem_set_alloc(legacy_s390_alloc);
     }
+
+    kvm_vm_enable_cap(s, KVM_CAP_S390_USER_SIGP, 0);
+
     return 0;
 }