diff --git a/enabler/src/de/schildbach/pte/AbstractNavitiaProvider.java b/enabler/src/de/schildbach/pte/AbstractNavitiaProvider.java
index e0bb6f52..72c687d2 100644
--- a/enabler/src/de/schildbach/pte/AbstractNavitiaProvider.java
+++ b/enabler/src/de/schildbach/pte/AbstractNavitiaProvider.java
@@ -144,7 +144,8 @@ public abstract class AbstractNavitiaProvider extends AbstractNetworkProvider
 	{
 		super(network);
 
-		httpClient.setHeader("Authorization", authorization);
+		if (authorization != null)
+			httpClient.setHeader("Authorization", authorization);
 	}
 
 	protected abstract String region();