diff --git a/src/main/java/org/caosdb/server/query/Query.java b/src/main/java/org/caosdb/server/query/Query.java
index 31d222c198a7b1bcdc8b44d9a425a6b626507d05..570435fcc3f002a4362c8a54db9b95c5133d65e9 100644
--- a/src/main/java/org/caosdb/server/query/Query.java
+++ b/src/main/java/org/caosdb/server/query/Query.java
@@ -1007,7 +1007,7 @@ public class Query implements QueryInterface, ToElementable, TransactionInterfac
   String getCacheKey() {
     final StringBuilder sb = new StringBuilder();
     if (this.user != null) {
-      sb.append(this.user.toString());
+      sb.append(this.user.getPrincipal().toString());
     }
     if (this.versioned) {
       sb.append("versioned");