diff --git a/src/storage/storage_backend.c b/src/storage/storage_backend.c
index 460b792614e75a5ab913de3e5ad6935cd36ae4d3..70bb48ae998145bfe2578701f060852a1f2b6cb4 100644
--- a/src/storage/storage_backend.c
+++ b/src/storage/storage_backend.c
@@ -283,7 +283,8 @@ virStorageBackendCreateBlockFrom(virConnectPtr conn ATTRIBUTE_UNUSED,
         && (fchown(fd, uid, gid) < 0)) {
         virReportSystemError(errno,
                              _("cannot chown '%s' to (%u, %u)"),
-                             vol->target.path, uid, gid);
+                             vol->target.path, (unsigned int) uid,
+                             (unsigned int) gid);
         goto cleanup;
     }
     if (fchmod(fd, vol->target.perms.mode) < 0) {
@@ -577,7 +578,8 @@ static int virStorageBackendCreateExecCommand(virStoragePoolObjPtr pool,
         && (chown(vol->target.path, uid, gid) < 0)) {
         virReportSystemError(errno,
                              _("cannot chown %s to (%u, %u)"),
-                             vol->target.path, uid, gid);
+                             vol->target.path, (unsigned int) uid,
+                             (unsigned int) gid);
         return -1;
     }
     if (chmod(vol->target.path, vol->target.perms.mode) < 0) {