diff --git a/CHANGELOG.md b/CHANGELOG.md
index 25e29c1d..7f5835f9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
+- Removed the code that changed the first character of the query parameter name to lower case
 - Added sanitization of guid values in query parameters
 
 ## [1.3.2] - 2023-09-21
diff --git a/Microsoft.Kiota.Abstractions.Tests/RequestInformationTests.cs b/Microsoft.Kiota.Abstractions.Tests/RequestInformationTests.cs
index 30108f04..be4cd9d8 100644
--- a/Microsoft.Kiota.Abstractions.Tests/RequestInformationTests.cs
+++ b/Microsoft.Kiota.Abstractions.Tests/RequestInformationTests.cs
@@ -111,6 +111,26 @@ public void DoesNotSetEmptyCollectionQueryParameters()
             Assert.False(requestInfo.QueryParameters.ContainsKey("select"));
         }
         [Fact]
+        public void DoesNotSetQueryParametersToLowerCaseFirstCharacter()
+        {
+            // Arrange as the request builders would
+            var requestInfo = new RequestInformation
+            {
+                HttpMethod = Method.GET,
+                UrlTemplate = "http://localhost/me{?%TenantId}"
+            };
+            Action<GetQueryParameters> q = x => x.TenantId = "Tenant1";
+            var qParams = new GetQueryParameters();
+            q.Invoke(qParams);
+
+            // Act 
+            requestInfo.AddQueryParameters(qParams);
+
+            // Assert
+            Assert.Contains("TenantId", requestInfo.QueryParameters.Keys);
+            Assert.DoesNotContain("tenantId", requestInfo.QueryParameters.Keys);
+        }
+        [Fact]
         public void SetsPathParametersOfDateTimeOffsetType()
         {
             // Arrange as the request builders would
@@ -406,5 +426,7 @@ internal class GetQueryParameters
         /// <summary>Search items by search phrases</summary>
         [QueryParameter("%24search")]
         public string Search { get; set; }
+        /// <summary>Restrict to TenantId</summary>
+        public string TenantId { get; set; }
     }
 }
diff --git a/src/RequestInformation.cs b/src/RequestInformation.cs
index 341cbf83..b9485a91 100644
--- a/src/RequestInformation.cs
+++ b/src/RequestInformation.cs
@@ -110,7 +110,7 @@ public void AddQueryParameters(object source)
                                             x => (
                                                 Name: x.GetCustomAttributes(false)
                                                     .OfType<QueryParameterAttribute>()
-                                                    .FirstOrDefault()?.TemplateName ?? x.Name.ToFirstCharacterLowerCase(),
+                                                    .FirstOrDefault()?.TemplateName ?? x.Name,
                                                 Value: x.GetValue(source)
                                             )
                                         )