diff --git a/cpa/profiling/profile_mean.py b/cpa/profiling/profile_mean.py
index 5eabf255..ef2781a6 100755
--- a/cpa/profiling/profile_mean.py
+++ b/cpa/profiling/profile_mean.py
@@ -24,7 +24,7 @@ def _compute_group_mean((cache_dir, images, normalization_name,
         normalization = normalizations[normalization_name]
         data, colnames, _ = cache.load(images, normalization=normalization)
         
-        cellcount = data.shape[0]
+        cellcount = np.ones(1) * data.shape[0]
         if method == 'cellcount':
             return cellcount
         
@@ -109,7 +109,7 @@ def profile_mean(cache_dir, group_name, filter=None, parallel=Uniprocessing(),
     elif method == 'mean+deciles':
         variables = variables + ['decile_%02d_%s' % (dec, v) for dec in range(10,100,10) for v in variables]
     elif method == 'cellcount':
-        variables = 'Cells_Count'
+        variables = ['Cells_Count']
     return Profiles.compute(keys, variables, _compute_group_mean, parameters,
                             parallel=parallel, group_name=group_name,
                             show_progress=show_progress,