diff --git a/gwcelery/tasks/external_skymaps.py b/gwcelery/tasks/external_skymaps.py
index 7dd1aca1e970d7e047fdda67c40d86d3963e5656..ff79f8a8f9df93cb36f2e7c9e468275ed86186b1 100644
--- a/gwcelery/tasks/external_skymaps.py
+++ b/gwcelery/tasks/external_skymaps.py
@@ -122,9 +122,9 @@ def combine_skymaps(skymapfilesbytes):
         #  Weight GW prob density by external sky map probabilities
         gw_sky['PROBDENSITY'] *= ext_sky[ext_ind]
         gw_sky['PROBDENSITY'] /= np.sum(gw_sky['PROBDENSITY'] * areas).value
-        
+
         #  Modify GW sky map with new data
-        write_sky_map(combinedskymap.name, gw_skymap)
+        write_sky_map(combinedskymap.name, gw_sky)
         return combinedskymap.read()