diff --git a/TimeZoneNames.DataBuilder/DataExtractor.cs b/TimeZoneNames.DataBuilder/DataExtractor.cs
index 3112db0..0c85ed2 100644
--- a/TimeZoneNames.DataBuilder/DataExtractor.cs
+++ b/TimeZoneNames.DataBuilder/DataExtractor.cs
@@ -107,7 +107,10 @@ private void LoadZoneAliases()
                         continue;
 
                     var aliases = aliasAttribute.Value.Split(' ');
-                    foreach (var alias in aliases)
+                    if (aliases.Length == 1)
+                        continue;
+
+                    foreach (var alias in aliases.Skip(1))
                         _data.CldrAliases.Add(alias.ToLowerInvariant(), aliases[0]);
                 }
             }