diff --git a/nireports/reportlets/xca.py b/nireports/reportlets/xca.py
index 6826f0cb..823b37bf 100644
--- a/nireports/reportlets/xca.py
+++ b/nireports/reportlets/xca.py
@@ -105,9 +105,7 @@ def plot_melodic_components(
     else:
         mask_img = nb.load(report_mask)
 
-    mask_sl = []
-    for j in range(3):
-        mask_sl.append(transform_to_2d(mask_img.get_fdata(), j))
+    mask_sl = [transform_to_2d(mask_img.get_fdata(), j) for j in range(3)]
 
     timeseries = np.loadtxt(os.path.join(melodic_dir, "melodic_mix"))
     power = np.loadtxt(os.path.join(melodic_dir, "melodic_FTmix"))