diff --git a/src/connection.cpp b/src/connection.cpp
index 0959fa2..060bb81 100644
--- a/src/connection.cpp
+++ b/src/connection.cpp
@@ -58,6 +58,10 @@ u_int64_t PackList::sumanddel(timeval t) {
   PackListNode *previous = NULL;
 
   while (current != NULL) {
+    if(current->is_sum == false){
+      retval += current->val->len;
+      current->is_sum = true;
+    }
     // std::cout << "Comparing " << current->val->time.tv_sec << " <= " <<
     // t.tv_sec - PERIOD << endl;
     if (current->val->time.tv_sec <= t.tv_sec - PERIOD) {
@@ -68,7 +72,6 @@ u_int64_t PackList::sumanddel(timeval t) {
       delete current;
       return retval;
     }
-    retval += current->val->len;
     previous = current;
     current = current->next;
   }
diff --git a/src/connection.h b/src/connection.h
index 1d3b224..c78bd06 100644
--- a/src/connection.h
+++ b/src/connection.h
@@ -30,6 +30,7 @@ public:
   PackListNode(Packet *m_val, PackListNode *m_next = NULL) {
     val = m_val;
     next = m_next;
+    is_sum = false;
   }
   ~PackListNode() {
     delete val;
@@ -38,6 +39,7 @@ public:
   }
   PackListNode *next;
   Packet *val;
+  bool is_sum;
 };
 
 class PackList {