diff --git a/src/Runner.Worker/ActionManifestManager.cs b/src/Runner.Worker/ActionManifestManager.cs
index d47eb4a14..7fb1f4f1b 100644
--- a/src/Runner.Worker/ActionManifestManager.cs
+++ b/src/Runner.Worker/ActionManifestManager.cs
@@ -75,12 +75,7 @@ namespace GitHub.Runner.Worker
 
                 // Add this file to the FileTable in executionContext if it hasn't been added already
                 // we use > since fileID is 1 indexed
-                if (executionContext.FileTable == null)
-                {
-                    executionContext.FileTable = new string[0];
-                    executionContext.FileTable.Add(fileRelativePath);
-                }
-                else if (fileId > executionContext.FileTable.Count)
+                if (fileId > executionContext.FileTable.Count)
                 {
                     executionContext.FileTable.Add(fileRelativePath);
                 }
diff --git a/src/Runner.Worker/ExecutionContext.cs b/src/Runner.Worker/ExecutionContext.cs
index 4655151a4..83e47c74c 100644
--- a/src/Runner.Worker/ExecutionContext.cs
+++ b/src/Runner.Worker/ExecutionContext.cs
@@ -53,7 +53,7 @@ namespace GitHub.Runner.Worker
         Dictionary<string, VariableValue> JobOutputs { get; }
         IDictionary<String, String> EnvironmentVariables { get; }
         IDictionary<String, ContextScope> Scopes { get; }
-        IList<String> FileTable { get; set; }
+        IList<String> FileTable { get; }
         StepsContext StepsContext { get; }
         DictionaryContextData ExpressionValues { get; }
         IList<IFunctionInfo> ExpressionFunctions { get; }
@@ -150,7 +150,7 @@ namespace GitHub.Runner.Worker
         public Dictionary<string, VariableValue> JobOutputs { get; private set; }
         public IDictionary<String, String> EnvironmentVariables { get; private set; }
         public IDictionary<String, ContextScope> Scopes { get; private set; }
-        public IList<String> FileTable { get; set; }
+        public IList<String> FileTable { get; private set; }
         public StepsContext StepsContext { get; private set; }
         public DictionaryContextData ExpressionValues { get; } = new DictionaryContextData();
         public IList<IFunctionInfo> ExpressionFunctions { get; } = new List<IFunctionInfo>();