diff --git a/src/public/package.cpp b/src/public/package.cpp
index f4818a7..1e7a5a5 100644
--- a/src/public/package.cpp
+++ b/src/public/package.cpp
@@ -27,7 +27,10 @@ bool Package::isValid() const {
     if (hdr.size > maximumSize())
         return false;
 
-    return calcHash() == hdr.hash;
+    if ( calcHash() == hdr.hash)
+        return true;
+
+    return calcHashOld() ==  hdr.hash;
 }
 
 void Package::reset() {
diff --git a/src/public/packages/abstractdata.cpp b/src/public/packages/abstractdata.cpp
index 790ff39..1609462 100644
--- a/src/public/packages/abstractdata.cpp
+++ b/src/public/packages/abstractdata.cpp
@@ -38,7 +38,12 @@ bool AbstractData::toPackage(Package &package,
     package.hdr.command = cmd();
     package.hdr.triggerHash = triggerHash;
     package.hdr.size = package.data.size();
-    package.hdr.hash = package.calcHash();
+
+    if (isOldPackage()) {
+        package.hdr.hash = package.calcHashOld();
+    } else {
+        package.hdr.hash = package.calcHash();
+    }
 
     return package.isValid();
 }
@@ -66,6 +71,10 @@ AbstractData::~AbstractData() {
 
 }
 
+bool QH::PKG::AbstractData::isOldPackage() const {
+    return false;
+}
+
 
 }
 }
diff --git a/src/public/packages/abstractdata.h b/src/public/packages/abstractdata.h
index 2ff957f..64e0dd1 100644
--- a/src/public/packages/abstractdata.h
+++ b/src/public/packages/abstractdata.h
@@ -164,6 +164,11 @@ protected:
      */
     virtual unsigned int localCode() const = 0;
 
+    /**
+     * @brief isOldPackage This method mark package as a old, old pacakges use the  Package::calcHashOld method for calculation hash sum of packages.
+     * @return true if the pacakge is old.
+     */
+    virtual bool isOldPackage() const;
 private:
     /**
      * @brief checkCmd This method check QH_PACKAGE macross.