diff --git a/dolfyn/tests/data/BenchFile01_avg.nc b/dolfyn/tests/data/BenchFile01_avg.nc
index 6f9dc223..bca0ffba 100644
--- a/dolfyn/tests/data/BenchFile01_avg.nc
+++ b/dolfyn/tests/data/BenchFile01_avg.nc
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:7ddb1f779abe560ba131c7984e909f00729ee936a971a9f58f9eb34f471b6544
-size 84577
+oid sha256:86c32e19441245f8db41b798315394673010dd877429fce2daed8a10a6eb5425
+size 89675
diff --git a/dolfyn/velocity.py b/dolfyn/velocity.py
index a920325f..97faebc1 100644
--- a/dolfyn/velocity.py
+++ b/dolfyn/velocity.py
@@ -540,6 +540,8 @@ def do_avg(self, raw_ds, out_ds=None, names=None):
         for ky in names:
             # set up dimensions and coordinates for Dataset
             dims_list = raw_ds[ky].dims
+            if any([ar for ar in dims_list if 'altraw' in ar]):
+                continue
             coords_dict = {}
             for nm in dims_list:
                 if 'time' in nm:
@@ -610,6 +612,8 @@ def do_var(self, raw_ds, out_ds=None, names=None, suffix='_var'):
         for ky in names:
             # set up dimensions and coordinates for dataarray
             dims_list = raw_ds[ky].dims
+            if any([ar for ar in dims_list if 'altraw' in ar]):
+                continue
             coords_dict = {}
             for nm in dims_list:
                 if 'time' in nm: