diff --git a/src/GreenHome.DataCopy/Program.cs b/src/GreenHome.DataCopy/Program.cs
index 069ca84..043d33a 100644
--- a/src/GreenHome.DataCopy/Program.cs
+++ b/src/GreenHome.DataCopy/Program.cs
@@ -38,6 +38,7 @@ internal static class Program
         var config = new ConfigurationBuilder()
             .SetBasePath(AppContext.BaseDirectory)
             .AddJsonFile("appsettings.json")
+            .AddEnvironmentVariables() // lets the server pass ConnectionStrings__* env vars
             .Build();
 
         var sqlServerCs = config.GetConnectionString("SqlServer")