diff --git a/enabler/src/de/schildbach/pte/CmtaProvider.java b/enabler/src/de/schildbach/pte/CmtaProvider.java
index 1bbe6643..4bd17277 100644
--- a/enabler/src/de/schildbach/pte/CmtaProvider.java
+++ b/enabler/src/de/schildbach/pte/CmtaProvider.java
@@ -36,6 +36,7 @@ public class CmtaProvider extends AbstractHafasClientInterfaceProvider {
         super(NetworkId.CMTA, API_BASE, PRODUCTS_MAP);
         setTimeZone("America/Chicago");
         setApiVersion("1.14");
+        setApiExt("SBB.TZT.1");
         setApiClient("{\"id\":\"CMTA\",\"type\":\"AND\"}");
     }
 }