diff --git a/sys/dev/xen/privcmd/privcmd.c b/sys/dev/xen/privcmd/privcmd.c
index 0ef6737df64..763c2f471c4 100644
--- a/sys/dev/xen/privcmd/privcmd.c
+++ b/sys/dev/xen/privcmd/privcmd.c
@@ -426,12 +426,10 @@ mmap_out:
 		if (mmap->addr == 0 && mmap->num == 0) {
 			error = HYPERVISOR_memory_op(XENMEM_acquire_resource,
 			    &adq);
-			if (error != 0) {
+			if (error != 0)
 				error = xen_translate_error(error);
-				break;
-			}
-			error = copyout(&adq.nr_frames, &mmap->num,
-			    sizeof(mmap->num));
+			else
+				mmap->num = adq.nr_frames;
 			break;
 		}
 
diff --git a/sys/xen/privcmd.h b/sys/xen/privcmd.h
index 55a1cdc8647..605ba018ac3 100644
--- a/sys/xen/privcmd.h
+++ b/sys/xen/privcmd.h
@@ -79,7 +79,7 @@ struct ioctl_privcmd_dmop {
 #define IOCTL_PRIVCMD_MMAPBATCH					\
 	_IOWR('E', 1, struct ioctl_privcmd_mmapbatch)
 #define IOCTL_PRIVCMD_MMAP_RESOURCE				\
-	_IOW('E', 2, struct ioctl_privcmd_mmapresource)
+	_IOWR('E', 2, struct ioctl_privcmd_mmapresource)
 #define IOCTL_PRIVCMD_DM_OP					\
 	_IOW('E', 3, struct ioctl_privcmd_dmop)
 #define IOCTL_PRIVCMD_RESTRICT					\