diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index 23022e9d32eb..b52cfdefecbf 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -571,7 +571,7 @@ void vm_userspace_mem_region_add(struct kvm_vm *vm,
 	 * already exist.
 	 */
 	region = (struct userspace_mem_region *) userspace_mem_region_find(
-		vm, guest_paddr, guest_paddr + npages * vm->page_size);
+		vm, guest_paddr, (guest_paddr + npages * vm->page_size) - 1);
 	if (region != NULL)
 		TEST_ASSERT(false, "overlapping userspace_mem_region already "
 			"exists\n"
@@ -587,15 +587,10 @@ void vm_userspace_mem_region_add(struct kvm_vm *vm,
 		region = region->next) {
 		if (region->region.slot == slot)
 			break;
-		if ((guest_paddr <= (region->region.guest_phys_addr
-				+ region->region.memory_size))
-			&& ((guest_paddr + npages * vm->page_size)
-				>= region->region.guest_phys_addr))
-			break;
 	}
 	if (region != NULL)
 		TEST_ASSERT(false, "A mem region with the requested slot "
-			"or overlapping physical memory range already exists.\n"
+			"already exists.\n"
 			"  requested slot: %u paddr: 0x%lx npages: 0x%lx\n"
 			"  existing slot: %u paddr: 0x%lx size: 0x%lx",
 			slot, guest_paddr, npages,