diff --git a/Framework/Azure/Cqrs.Azure.Functions.Isolated/CqrsIsolatedFunctionHost.cs b/Framework/Azure/Cqrs.Azure.Functions.Isolated/CqrsIsolatedFunctionHost.cs
index 05668c36e..087ea6609 100644
--- a/Framework/Azure/Cqrs.Azure.Functions.Isolated/CqrsIsolatedFunctionHost.cs
+++ b/Framework/Azure/Cqrs.Azure.Functions.Isolated/CqrsIsolatedFunctionHost.cs
@@ -99,7 +99,7 @@ protected static void PrepareConfigurationManager()
 			string localRoot = Environment.GetEnvironmentVariable("AzureWebJobsScriptRoot");
 			string azureRoot = Environment.GetEnvironmentVariable("HOME");
 			azureRoot = string.IsNullOrWhiteSpace(azureRoot)
-				? string.Empty
+				? null
 				: $"{azureRoot}/site/wwwroot";
 
 			string actualRoot = localRoot ?? azureRoot ?? Environment.CurrentDirectory;
@@ -149,7 +149,7 @@ protected virtual void PrepareHost()
 					string localRoot = Environment.GetEnvironmentVariable("AzureWebJobsScriptRoot");
 					string azureRoot = Environment.GetEnvironmentVariable("HOME");
 					azureRoot = string.IsNullOrWhiteSpace(azureRoot)
-						? string.Empty
+						? null
 						: $"{azureRoot}/site/wwwroot";
 
 					string actualRoot = localRoot ?? azureRoot ?? Environment.CurrentDirectory;
@@ -225,7 +225,7 @@ Microsoft.Extensions.Configuration.IConfigurationRoot config
 			string localRoot = Environment.GetEnvironmentVariable("AzureWebJobsScriptRoot");
 			string azureRoot = Environment.GetEnvironmentVariable("HOME");
 			azureRoot = string.IsNullOrWhiteSpace(azureRoot)
-				? string.Empty
+				? null
 				: $"{azureRoot}/site/wwwroot";
 
 			string actualRoot = localRoot ?? azureRoot ?? Environment.CurrentDirectory;