diff --git a/modules/icing/pirep_goes.py b/modules/icing/pirep_goes.py
index 242715e84e33766ef3cbaedc88534627e79927c0..65dbbf7b024d1b46f559a6f06bc09baf9e66e97e 100644
--- a/modules/icing/pirep_goes.py
+++ b/modules/icing/pirep_goes.py
@@ -1688,14 +1688,15 @@ jdays= [['070', '071', '072', '073', '074', '075'], ['078', '079', '080', '081',
 
 
 def make_ts_bins():
-    edges = []
     nbins = len(jdays)
+    edges = [[] for k in range(nbins)]
     for k in range(nbins):
         num = len(jdays[k])
         jd_a = jdays[k][0]
         ts_a = get_timestamp('2019-'+jd_a+'_00:00', format_code='%Y-%j_%H:%M')
         jd_b = jdays[k][num-1]
         ts_b = get_timestamp('2019-'+jd_b+'_23:59', format_code='%Y-%j_%H:%M')
-        edges.append(ts_a)
-        edges.append(ts_b)
-    return edges
\ No newline at end of file
+        edges[k].append(ts_a)
+        edges[k].append(ts_b)
+
+    return edges