diff --git a/library/include/mobilisis/calculate_price.h b/library/include/mobilisis/calculate_price.h
index c1ba701..17f1b2f 100644
--- a/library/include/mobilisis/calculate_price.h
+++ b/library/include/mobilisis/calculate_price.h
@@ -32,6 +32,11 @@ struct CALCULATE_LIBRARY_API price_t {
     double brutto;
     double vat_percentage;
     double vat;
+
+    explicit price_t() {
+        units = 0;
+        netto = brutto = vat_percentage = vat = 0.0;
+    }
 };
 
 enum class PERMIT_TYPE : quint8 {