diff --git a/src/librssguard/3rd-party/sc/simplecrypt.cpp b/src/librssguard/3rd-party/sc/simplecrypt.cpp
index 796568540..cf7297920 100644
--- a/src/librssguard/3rd-party/sc/simplecrypt.cpp
+++ b/src/librssguard/3rd-party/sc/simplecrypt.cpp
@@ -104,7 +104,11 @@ QByteArray SimpleCrypt::encryptToByteArray(QByteArray plaintext) {
     flags |= CryptoFlagChecksum;
     QDataStream s(&integrityProtection, QIODevice::WriteOnly);
 
+#if QT_VERSION_MAJOR == 6
     s << qChecksum(ba);
+#else
+    s << qChecksum(ba, ba.length());
+#endif
   }
   else if (m_protectionMode == ProtectionHash) {
     flags |= CryptoFlagHash;
@@ -228,7 +232,11 @@ QByteArray SimpleCrypt::decryptToByteArray(QByteArray cypher) {
     }
 
     ba = ba.mid(2);
+#if QT_VERSION_MAJOR == 6
     quint16 checksum = qChecksum(ba);
+#else
+    quint16 checksum = qChecksum(ba, ba.length());
+#endif
 
     integrityOk = (checksum == storedChecksum);
   }