Index: jitsi-2.3.4901/lib/src/gdata-java-client/java/src/com/google/gdata/wireformats/AltFormat.java
===================================================================
--- jitsi-2.3.4901.orig/lib/src/gdata-java-client/java/src/com/google/gdata/wireformats/AltFormat.java	2012-09-27 14:40:10.000000000 -0400
+++ jitsi-2.3.4901/lib/src/gdata-java-client/java/src/com/google/gdata/wireformats/AltFormat.java	2013-11-11 10:42:56.309608000 -0500
@@ -396,7 +396,7 @@
       if (types == null) {
         acceptableTypes = ImmutableSet.of();
       } else {
-        acceptableTypes = ImmutableSet.of(types);
+        acceptableTypes = ImmutableSet.copyOf(types);
       }
       return this;
     }
