diff --git a/warn-stranded.lua b/warn-stranded.lua
index bdbe7dd017..63bede9c39 100644
--- a/warn-stranded.lua
+++ b/warn-stranded.lua
@@ -345,7 +345,7 @@ local function getStrandedUnits()
     table.sort(rawGroups, compareGroups)
 
     -- The biggest group is not stranded
-    mainGroup = rawGroups[1]['walkGroup']
+    mainGroup = rawGroups[#rawGroups]['walkGroup']
     table.remove(rawGroups, #rawGroups)
 
     -- Merge ignoredGroup with grouped