diff --git a/libcockatrice_deck_list/libcockatrice/deck_list/deck_list.cpp b/libcockatrice_deck_list/libcockatrice/deck_list/deck_list.cpp
index a294601fb..71a04cce3 100644
--- a/libcockatrice_deck_list/libcockatrice/deck_list/deck_list.cpp
+++ b/libcockatrice_deck_list/libcockatrice/deck_list/deck_list.cpp
@@ -182,7 +182,7 @@ bool DeckList::loadFromFile_Native(QIODevice *device)
     return loadFromXml(&xml);
 }
 
-bool DeckList::saveToFile_Native(QIODevice *device)
+bool DeckList::saveToFile_Native(QIODevice *device) const
 {
     QXmlStreamWriter xml(device);
     xml.setAutoFormatting(true);
@@ -393,7 +393,7 @@ bool DeckList::loadFromFile_Plain(QIODevice *device)
     return loadFromStream_Plain(in, false);
 }
 
-bool DeckList::saveToStream_Plain(QTextStream &stream, bool prefixSideboardCards, bool slashTappedOutSplitCards)
+bool DeckList::saveToStream_Plain(QTextStream &stream, bool prefixSideboardCards, bool slashTappedOutSplitCards) const
 {
     auto writeToStream = [&stream, prefixSideboardCards, slashTappedOutSplitCards](const auto node, const auto card) {
         if (prefixSideboardCards && node->getName() == DECK_ZONE_SIDE) {
@@ -410,13 +410,13 @@ bool DeckList::saveToStream_Plain(QTextStream &stream, bool prefixSideboardCards
     return true;
 }
 
-bool DeckList::saveToFile_Plain(QIODevice *device, bool prefixSideboardCards, bool slashTappedOutSplitCards)
+bool DeckList::saveToFile_Plain(QIODevice *device, bool prefixSideboardCards, bool slashTappedOutSplitCards) const
 {
     QTextStream out(device);
     return saveToStream_Plain(out, prefixSideboardCards, slashTappedOutSplitCards);
 }
 
-QString DeckList::writeToString_Plain(bool prefixSideboardCards, bool slashTappedOutSplitCards)
+QString DeckList::writeToString_Plain(bool prefixSideboardCards, bool slashTappedOutSplitCards) const
 {
     QString result;
     QTextStream out(&result);
diff --git a/libcockatrice_deck_list/libcockatrice/deck_list/deck_list.h b/libcockatrice_deck_list/libcockatrice/deck_list/deck_list.h
index d0ca55342..808733b09 100644
--- a/libcockatrice_deck_list/libcockatrice/deck_list/deck_list.h
+++ b/libcockatrice_deck_list/libcockatrice/deck_list/deck_list.h
@@ -201,16 +201,17 @@ public:
     bool loadFromString_Native(const QString &nativeString);
     QString writeToString_Native() const;
     bool loadFromFile_Native(QIODevice *device);
-    bool saveToFile_Native(QIODevice *device);
+    bool saveToFile_Native(QIODevice *device) const;
     ///@}
 
     /// @name Serialization (Plain text)
     ///@{
     bool loadFromStream_Plain(QTextStream &stream, bool preserveMetadata);
     bool loadFromFile_Plain(QIODevice *device);
-    bool saveToStream_Plain(QTextStream &stream, bool prefixSideboardCards, bool slashTappedOutSplitCards);
-    bool saveToFile_Plain(QIODevice *device, bool prefixSideboardCards = true, bool slashTappedOutSplitCards = false);
-    QString writeToString_Plain(bool prefixSideboardCards = true, bool slashTappedOutSplitCards = false);
+    bool saveToStream_Plain(QTextStream &stream, bool prefixSideboardCards, bool slashTappedOutSplitCards) const;
+    bool
+    saveToFile_Plain(QIODevice *device, bool prefixSideboardCards = true, bool slashTappedOutSplitCards = false) const;
+    QString writeToString_Plain(bool prefixSideboardCards = true, bool slashTappedOutSplitCards = false) const;
     ///@}
 
     /// @name Deck manipulation