diff --git a/modules/swagger-codegen/src/main/resources/csharp/ApiClient.mustache b/modules/swagger-codegen/src/main/resources/csharp/ApiClient.mustache
index 38d95461d1d..3399d84297d 100644
--- a/modules/swagger-codegen/src/main/resources/csharp/ApiClient.mustache
+++ b/modules/swagger-codegen/src/main/resources/csharp/ApiClient.mustache
@@ -170,7 +170,7 @@ namespace {{packageName}}.Client
         /// <returns>Escaped string.</returns>
         public string EscapeString(string str)
         {
-            return RestSharp.Extensions.StringExtensions.UrlDecode(str);
+            return RestSharp.Extensions.StringExtensions.UrlEncode(str);
         }
     
         /// <summary>