diff --git a/src/Couchbase.AspNet/CouchbaseWebProviderExtensions.cs b/src/Couchbase.AspNet/CouchbaseWebProviderExtensions.cs
index e713327..96a58fd 100644
--- a/src/Couchbase.AspNet/CouchbaseWebProviderExtensions.cs
+++ b/src/Couchbase.AspNet/CouchbaseWebProviderExtensions.cs
@@ -6,14 +6,14 @@ namespace Couchbase.AspNet
 
     internal static class CouchbaseWebProviderExtensions
     {
-        //Currently not used - when project relies on MS.Logging then we can switch
         public static string PrefixIdentifier(this ICouchbaseWebProvider provider, string id)
         {
             if (string.IsNullOrWhiteSpace(id))
             {
                 throw new ArgumentNullException(nameof(id));
             }
-            return provider.Prefix == null ? id : string.Concat(provider.Prefix, "-", id);
+
+            return provider.Prefix != null && !id.StartsWith(provider.Prefix) ? string.Concat(provider.Prefix, "-", id) : id;
         }
     }
 }
diff --git a/test/Couchbase.AspNet.UnitTests/CouchbaseWebProviderExtensionsTests.cs b/test/Couchbase.AspNet.UnitTests/CouchbaseWebProviderExtensionsTests.cs
index 529484a..c981fb9 100644
--- a/test/Couchbase.AspNet.UnitTests/CouchbaseWebProviderExtensionsTests.cs
+++ b/test/Couchbase.AspNet.UnitTests/CouchbaseWebProviderExtensionsTests.cs
@@ -10,6 +10,7 @@ namespace Couchbase.AspNet.UnitTests
 {
     public class CouchbaseWebProviderExtensionsTests
     {
+        [InlineData("xxx", "xxx-mysession", "xxx-mysession")]
         [InlineData("xxx", "mysession", "xxx-mysession")]
         [InlineData(null, "mysession", "mysession")]
         [Theory]