diff --git a/SparkleLib/SparkleRepoBase.cs b/SparkleLib/SparkleRepoBase.cs
index ca62bc1df..a7b9109d9 100755
--- a/SparkleLib/SparkleRepoBase.cs
+++ b/SparkleLib/SparkleRepoBase.cs
@@ -83,7 +83,7 @@ public abstract class SparkleRepoBase {
         public double ProgressPercentage { get; private set; }
         public double ProgressSpeed { get; private set; }
 
-        public string Identifier {
+        public virtual string Identifier {
             get {
                 if (this.identifier != null)
                     return this.identifier;