diff --git a/src/SparkPost.Tests/DataMapperTests.cs b/src/SparkPost.Tests/DataMapperTests.cs
index 3a6e54e3..863e0c72 100644
--- a/src/SparkPost.Tests/DataMapperTests.cs
+++ b/src/SparkPost.Tests/DataMapperTests.cs
@@ -613,6 +613,15 @@ public void template_id()
                 mapper.ToDictionary(content)["template_id"].ShouldEqual(value);
             }
 
+            [Test]
+            public void ab_test_id()
+            {
+                var value = Guid.NewGuid().ToString();
+                content.AbTestId = value;
+                mapper.ToDictionary(content)["ab_test_id"].ShouldEqual(value);
+            }
+
+
             [Test]
             public void html()
             {
diff --git a/src/SparkPost/Content.cs b/src/SparkPost/Content.cs
index ab89b095..bef8f9e5 100644
--- a/src/SparkPost/Content.cs
+++ b/src/SparkPost/Content.cs
@@ -22,5 +22,7 @@ public Content()
         public IList<InlineImage> InlineImages { get; set; }
         public string TemplateId { get; set; }
         public bool? UseDraftTemplate { get; set; }
+
+        public string AbTestId { get; set; }
     }
 }
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