diff --git a/src/main/java/de/ids_mannheim/korap/rewrite/CollectionCleanRewrite.java b/src/main/java/de/ids_mannheim/korap/rewrite/CollectionCleanRewrite.java
index f827871..5aacdd5 100644
--- a/src/main/java/de/ids_mannheim/korap/rewrite/CollectionCleanRewrite.java
+++ b/src/main/java/de/ids_mannheim/korap/rewrite/CollectionCleanRewrite.java
@@ -1,5 +1,6 @@
 package de.ids_mannheim.korap.rewrite;
 
+import java.util.Arrays;
 import java.util.Iterator;
 
 import com.fasterxml.jackson.databind.JsonNode;
@@ -7,7 +8,6 @@
 
 import de.ids_mannheim.korap.config.KustvaktConfiguration;
 import de.ids_mannheim.korap.user.User;
-import edu.emory.mathcs.backport.java.util.Arrays;
 
 /**
  * EM: not used anymore. This rewrite was to remove an empty koral:doc
diff --git a/src/main/java/de/ids_mannheim/korap/utils/KoralCollectionQueryBuilder.java b/src/main/java/de/ids_mannheim/korap/utils/KoralCollectionQueryBuilder.java
index 7dd99ad..28e75e9 100644
--- a/src/main/java/de/ids_mannheim/korap/utils/KoralCollectionQueryBuilder.java
+++ b/src/main/java/de/ids_mannheim/korap/utils/KoralCollectionQueryBuilder.java
@@ -1,5 +1,6 @@
 package de.ids_mannheim.korap.utils;
 
+import java.util.Arrays;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -12,7 +13,6 @@
 import de.ids_mannheim.korap.exceptions.StatusCodes;
 import de.ids_mannheim.korap.query.serialize.CollectionQueryProcessor;
 import de.ids_mannheim.korap.response.Notifications;
-import edu.emory.mathcs.backport.java.util.Arrays;
 
 /**
  * convenience builder class for collection query