diff --git a/Microsoft.Azure.Cosmos/src/Resource/Throughput/ThroughputResponse.cs b/Microsoft.Azure.Cosmos/src/Resource/Throughput/ThroughputResponse.cs
index c6c96bda77..5cca91dd9c 100644
--- a/Microsoft.Azure.Cosmos/src/Resource/Throughput/ThroughputResponse.cs
+++ b/Microsoft.Azure.Cosmos/src/Resource/Throughput/ThroughputResponse.cs
@@ -82,7 +82,7 @@ public bool? IsReplacePending
             {
                 if (this.Headers.GetHeaderValue<string>(WFConstants.BackendHeaders.OfferReplacePending) != null)
                 {
-                    return Boolean.Parse(this.Headers.GetHeaderValue<string>(WFConstants.BackendHeaders.MinimumRUsForOffer));
+                    return Boolean.Parse(this.Headers.GetHeaderValue<string>(WFConstants.BackendHeaders.OfferReplacePending));
                 }
                 return null;
             }
@@ -97,4 +97,4 @@ public static implicit operator ThroughputProperties(ThroughputResponse response
             return response.Resource;
         }
     }
-}
\ No newline at end of file
+}
diff --git a/Microsoft.Azure.Cosmos/tests/Microsoft.Azure.Cosmos.Tests/Resource/Throughput/ThroughputResponseTests.cs b/Microsoft.Azure.Cosmos/tests/Microsoft.Azure.Cosmos.Tests/Resource/Throughput/ThroughputResponseTests.cs
new file mode 100644
index 0000000000..e7df232d01
--- /dev/null
+++ b/Microsoft.Azure.Cosmos/tests/Microsoft.Azure.Cosmos.Tests/Resource/Throughput/ThroughputResponseTests.cs
@@ -0,0 +1,43 @@
+using System.Net;
+using Microsoft.Azure.Documents;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace Microsoft.Azure.Cosmos.Resource.Throughput
+{
+    [TestClass]
+    public class ThroughputResponseTests
+    {
+        [TestMethod]
+        public void OfferReplacePendingHeaderNotSetReturnsNull()
+        {
+            ThroughputResponse throughputResponse =
+                new ThroughputResponse(HttpStatusCode.OK, new Headers(), null, null);
+
+            Assert.IsNull(throughputResponse.IsReplacePending);
+        }
+
+        [TestMethod]
+        public void OfferReplacePendingHeaderSetTrueReturnsTrue()
+        {
+            ThroughputResponse throughputResponse = new ThroughputResponse(HttpStatusCode.OK, new Headers
+            {
+                {WFConstants.BackendHeaders.OfferReplacePending, "true"}
+            }, null, null);
+
+            Assert.IsNotNull(throughputResponse.IsReplacePending);
+            Assert.IsTrue(throughputResponse.IsReplacePending.Value);
+        }
+
+        [TestMethod]
+        public void OfferReplacePendingHeaderSetFalseReturnsFalse()
+        {
+            ThroughputResponse throughputResponse = new ThroughputResponse(HttpStatusCode.OK, new Headers
+            {
+                {WFConstants.BackendHeaders.OfferReplacePending, "false"}
+            }, null, null);
+
+            Assert.IsNotNull(throughputResponse.IsReplacePending);
+            Assert.IsFalse(throughputResponse.IsReplacePending.Value);
+        }
+    }
+}
diff --git a/changelog.md b/changelog.md
index a1615dc66a..c321458897 100644
--- a/changelog.md
+++ b/changelog.md
@@ -17,6 +17,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - [#988](https://github.com/Azure/azure-cosmos-dotnet-v3/pull/988) Fixed query mutating due to retry of gone / name cache is stale.
 - [#999](https://github.com/Azure/azure-cosmos-dotnet-v3/pull/999) Fixed grabbing extra page and updated continuation token on exception path.
 - [#1013](https://github.com/Azure/azure-cosmos-dotnet-v3/pull/1013) Gateway OperationCanceledException are now returned as request timeouts
+- [#1023](https://github.com/Azure/azure-cosmos-dotnet-v3/pull/1023) Fixed ThroughputResponse.IsReplacePending header mapping
 
 ## <a name="3.4.1"/> [3.4.1](https://www.nuget.org/packages/Microsoft.Azure.Cosmos/3.4.1) - 2019-11-06