diff --git a/src/quick/ZugferdQuickDescriptor.php b/src/quick/ZugferdQuickDescriptor.php
index d488602..a6c5b07 100644
--- a/src/quick/ZugferdQuickDescriptor.php
+++ b/src/quick/ZugferdQuickDescriptor.php
@@ -57,6 +57,13 @@ class ZugferdQuickDescriptor extends ZugferdDocumentBuilder
      */
     protected $totalPrepaidAmount = 0.0;
 
+    /**
+     * Internal flag to see if the totals are alread calculated
+     *
+     * @var boolean
+     */
+    protected $totalsAreCalculated = false;
+
     /**
      * Returns the profile of the descriptor
      *
@@ -1035,6 +1042,10 @@ public function doSetPrepaidAmount(float $totalPrepaidAmount = 0.0): ZugferdQuic
      */
     protected function doCalcTotals(): ZugferdQuickDescriptor
     {
+        if ($this->totalsAreCalculated !== false) {
+            return $this;
+        }
+
         $this->writeVatBreakDown();
         $this->setDocumentSummation(
             $this->summarizeVatTableElement(self::VT_BASISAMOUNT) + $this->summarizeVatTableElement(self::VT_CALCULATEDAMOUNT),
@@ -1047,6 +1058,9 @@ protected function doCalcTotals(): ZugferdQuickDescriptor
             0.0,
             $this->totalPrepaidAmount
         );
+
+        $this->totalsAreCalculated = true;
+
         return $this;
     }