diff --git a/Manager.cpp b/Manager.cpp
index d2fee62..5abdd35 100644
--- a/Manager.cpp
+++ b/Manager.cpp
@@ -265,7 +265,7 @@ namespace util
         if (!this->assignment_exists(as.get_user_id(), as.get_task_id()))
             throw Error(301, "Eine solche Zuordnung existiert nicht.");
         int assignment_nr = 0;
-        for (int i = 0; i < this->assignments.size() - 1; ++i) {
+        for (int i = 0; i < this->assignments.size(); ++i) {
             if (this->assignments[i]->get_user_id() == as.get_user_id() && this->assignments[i]->get_task_id() == as.get_task_id()) {
                 assignment_nr = i;
                 break;