diff --git a/Dapplo.HttpExtensions.Shared/HttpRequestMessageConfiguration.cs b/Dapplo.HttpExtensions.Shared/HttpRequestMessageConfiguration.cs
index 1b6c8d6..2bbf2f2 100644
--- a/Dapplo.HttpExtensions.Shared/HttpRequestMessageConfiguration.cs
+++ b/Dapplo.HttpExtensions.Shared/HttpRequestMessageConfiguration.cs
@@ -36,6 +36,6 @@ public class HttpRequestMessageConfiguration : IHttpRequestConfiguration
 		/// <summary>
 		/// A set of properties for the HTTP request.
 		/// </summary>
-		public IDictionary<string, object> Properties { get; }= new Dictionary<string, object>();
+		public IDictionary<string, object> Properties { get; set; }= new Dictionary<string, object>();
 	}
 }