diff --git a/src/colnod/colnodapi.h b/src/colnod/colnodapi.h
index 76c7bec..68ed360 100644
--- a/src/colnod/colnodapi.h
+++ b/src/colnod/colnodapi.h
@@ -24,7 +24,7 @@ class Timestamp : public serversdk::DatabaseTable {
     TABLE_PROPERTY(qint64, timestamp, set_timestamp, 0)
 public:
     Timestamp() = default;
-    Timestamp(const Timestamp &time)
+    explicit Timestamp(const Timestamp &time)
     {
         this->set_timestamp(time.timestamp());
     }