diff --git a/src/Microsoft.ML.Core/Utilities/Utils.cs b/src/Microsoft.ML.Core/Utilities/Utils.cs
index 3f9f17c5dc..fbdb3a791d 100644
--- a/src/Microsoft.ML.Core/Utilities/Utils.cs
+++ b/src/Microsoft.ML.Core/Utilities/Utils.cs
@@ -841,7 +841,7 @@ public static void BuildSubsetMaps(int lim, IEnumerable<DataViewSchema.Column> c
 
             // REVIEW: Better names?
             List<int> mapList = new List<int>();
-            invMap = invMap = Enumerable.Repeat(-1, lim).ToArray<int>();
+            invMap = Enumerable.Repeat(-1, lim).ToArray<int>();
 
             foreach (var col in columnsNeeded)
             {