diff --git a/src/GoogleMeasurementProtocol_NetStandard/Extensions/ListExtensions.cs b/src/GoogleMeasurementProtocol_NetStandard/Extensions/ListExtensions.cs
index 3604ff2..3d4abee 100644
--- a/src/GoogleMeasurementProtocol_NetStandard/Extensions/ListExtensions.cs
+++ b/src/GoogleMeasurementProtocol_NetStandard/Extensions/ListExtensions.cs
@@ -2,13 +2,14 @@
 using System.Collections.Generic;
 using System.Globalization;
 using System.Net.Http;
+using System.Threading.Tasks;
 using GoogleMeasurementProtocol.Parameters;
 
 namespace GoogleMeasurementProtocol.Extensions
 {
     public static class ListExtensions
     {
-        public static string GenerateQueryString(this List<Parameter> list)
+        public static async Task<string> GenerateQueryStringAsync(this List<Parameter> list)
         {
             if (list == null)
             {
@@ -39,13 +40,13 @@ public static string GenerateQueryString(this List<Parameter> list)
 
             using (var formUrlEncodedContent = new FormUrlEncodedContent(paramsDictionary))
             {
-                return formUrlEncodedContent.ReadAsStringAsync().Result;
+                return await formUrlEncodedContent.ReadAsStringAsync();
             }
         }
 
-        public static StringContent GenerateStringContent(this List<Parameter> list)
+        public static async Task<StringContent> GenerateStringContentAsync(this List<Parameter> list)
         {
-            return new StringContent(list.GenerateQueryString());
+            return new StringContent(await list.GenerateQueryStringAsync());
         }
     }
 }
diff --git a/src/GoogleMeasurementProtocol_NetStandard/Requests/Batch/BatchRequest.cs b/src/GoogleMeasurementProtocol_NetStandard/Requests/Batch/BatchRequest.cs
index 8bbeae0..2f335a1 100644
--- a/src/GoogleMeasurementProtocol_NetStandard/Requests/Batch/BatchRequest.cs
+++ b/src/GoogleMeasurementProtocol_NetStandard/Requests/Batch/BatchRequest.cs
@@ -38,7 +38,7 @@ private async Task MakeRequestAsync()
 
             foreach (var request in _requests)
             {
-                sb.AppendLine(request.Parameters.GenerateQueryString());
+                sb.AppendLine(await request.Parameters.GenerateQueryStringAsync());
             }
 
             var response =
diff --git a/src/GoogleMeasurementProtocol_NetStandard/Requests/RequestBase.cs b/src/GoogleMeasurementProtocol_NetStandard/Requests/RequestBase.cs
index b1b3f9d..67c30f5 100644
--- a/src/GoogleMeasurementProtocol_NetStandard/Requests/RequestBase.cs
+++ b/src/GoogleMeasurementProtocol_NetStandard/Requests/RequestBase.cs
@@ -34,9 +34,9 @@ internal async Task<string> MakeRequestAsync(string httpMethod, HttpClient httpC
             ValidateRequestParams();
 
             if (httpMethod == HttpMethod.GET)
-                return await httpClient.GetStringAsync($"{url}?{Parameters.GenerateQueryString()}").ConfigureAwait(false);
+                return await httpClient.GetStringAsync($"{url}?{await Parameters.GenerateQueryStringAsync()}").ConfigureAwait(false);
 
-            var response = await httpClient.PostAsync(url, Parameters.GenerateStringContent()).ConfigureAwait(false);
+            var response = await httpClient.PostAsync(url, await Parameters.GenerateStringContentAsync()).ConfigureAwait(false);
             response.EnsureSuccessStatusCode();
 
             return await response.Content.ReadAsStringAsync();