diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index 2a76eca7029d..464ac07e86b3 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -817,7 +817,7 @@ static void __vm_mem_region_delete(struct kvm_vm *vm,
 		kvm_munmap(region->mmap_alias, region->mmap_size);
 		close(region->fd);
 	}
-	if (region->region.guest_memfd >= 0)
+	if ((int)region->region.guest_memfd >= 0)
 		close(region->region.guest_memfd);
 
 	free(region);