diff --git a/src/main/java/de/ids_mannheim/korap/resource/LayerProcessor.java b/src/main/java/de/ids_mannheim/korap/resource/LayerProcessor.java
index 71d30b1..90b6319 100644
--- a/src/main/java/de/ids_mannheim/korap/resource/LayerProcessor.java
+++ b/src/main/java/de/ids_mannheim/korap/resource/LayerProcessor.java
@@ -28,15 +28,23 @@
             }
         }else if (node.at("/query/wrap/@type").asText()
                 .equals("koral:termGroup")) {
-            Iterator<JsonNode> nodes = node.at("/query/wrap/operands")
-                    .elements();
-            while (nodes.hasNext()) {
-                JsonNode n = nodes.next();
-                if (n.path("foundry").isMissingNode()) {
-                    String layer = n.path("layer").asText();
-                    ObjectNode obj = (ObjectNode) n;
-                    obj.put("foundry", mapper.findFoundry(layer));
-                }
+            processTermGroup(node.at("/query/wrap/operands"));
+        }
+        return node;
+    }
+
+    private JsonNode processTermGroup(JsonNode node) {
+        Iterator<JsonNode> nodes = node.elements();
+        while (nodes.hasNext()) {
+            JsonNode n = nodes.next();
+            if (n.path("@type").asText().equals("koral:termGroup"))
+                n = processTermGroup(n.path("operands"));
+
+            if (n.path("@type").asText().equals("koral:term") && n
+                    .path("foundry").isMissingNode()) {
+                String layer = n.path("layer").asText();
+                ObjectNode obj = (ObjectNode) n;
+                obj.put("foundry", mapper.findFoundry(layer));
             }
         }
         return node;
diff --git a/src/test/java/RewriteTest.java b/src/test/java/RewriteTest.java
index db33a1a..92e61fd 100644
--- a/src/test/java/RewriteTest.java
+++ b/src/test/java/RewriteTest.java
@@ -16,6 +16,7 @@
     private static String simple_rewrite_query = "[base=Haus]";
     private static String complex_rewrite_query = "<c=INFC>";
     private static String complex_rewrite_query2 = "[orth=laufe/i & base!=Lauf]";
+    private static String complex_rewrite_query3 = "[(base=laufen | base=gehen) & tt/pos=VVFIN]";
 
     public RewriteTest() {
 
@@ -51,7 +52,7 @@
         RewriteProcessor processor = new RewriteProcessor();
 
         QuerySerializer s = new QuerySerializer();
-        s.setQuery(complex_rewrite_query2, "poliqarp");
+        s.setQuery(complex_rewrite_query3, "poliqarp");
         System.out.println("query " + s.toJSON());
         System.out.println("finished node " + processor.process(s.toJSON()));
     }