diff --git a/lib/src/module.dart b/lib/src/module.dart
index 27ce248fd..9498de284 100644
--- a/lib/src/module.dart
+++ b/lib/src/module.dart
@@ -617,7 +617,7 @@ abstract class Module {
         inputs.containsKey(name) ||
         inOuts.containsKey(name)) {
       throw UnavailableReservedNameException.withMessage(
-          'Already defined a port with name "$name".');
+          'Already defined a port with name "$name" in module "${this.name}".');
     }
   }