diff --git a/cockatrice/src/interface/widgets/deck_editor/deck_list_history_manager_widget.cpp b/cockatrice/src/interface/widgets/deck_editor/deck_list_history_manager_widget.cpp
index 907027fa3..e574ddf6c 100644
--- a/cockatrice/src/interface/widgets/deck_editor/deck_list_history_manager_widget.cpp
+++ b/cockatrice/src/interface/widgets/deck_editor/deck_list_history_manager_widget.cpp
@@ -107,7 +107,7 @@ void DeckListHistoryManagerWidget::doUndo()
         return;
     }
 
-    deckListModel->getDeckList()->restoreMemento(historyManager->undo(deckListModel->getDeckList()));
+    historyManager->undo(deckListModel->getDeckList());
     deckListModel->rebuildTree();
     emit deckListModel->layoutChanged();
     emit requestDisplayWidgetSync();
@@ -121,7 +121,7 @@ void DeckListHistoryManagerWidget::doRedo()
         return;
     }
 
-    deckListModel->getDeckList()->restoreMemento(historyManager->redo(deckListModel->getDeckList()));
+    historyManager->redo(deckListModel->getDeckList());
     deckListModel->rebuildTree();
 
     emit deckListModel->layoutChanged();
@@ -144,13 +144,13 @@ void DeckListHistoryManagerWidget::onListClicked(QListWidgetItem *item)
         const auto redoStack = historyManager->getRedoStack();
         int steps = redoStack.size() - index;
         for (int i = 0; i < steps; ++i) {
-            deckListModel->getDeckList()->restoreMemento(historyManager->redo(deckListModel->getDeckList()));
+            historyManager->redo(deckListModel->getDeckList());
         }
     } else if (mode == "undo") {
         const auto undoStack = historyManager->getUndoStack();
         int steps = undoStack.size() - 1 - index;
         for (int i = 0; i < steps + 1; ++i) {
-            deckListModel->getDeckList()->restoreMemento(historyManager->undo(deckListModel->getDeckList()));
+            historyManager->undo(deckListModel->getDeckList());
         }
     }
 
diff --git a/libcockatrice_deck_list/CMakeLists.txt b/libcockatrice_deck_list/CMakeLists.txt
index b76c12ec3..d9b27354b 100644
--- a/libcockatrice_deck_list/CMakeLists.txt
+++ b/libcockatrice_deck_list/CMakeLists.txt
@@ -20,9 +20,13 @@ endif()
 
 add_library(
   libcockatrice_deck_list STATIC
-  ${MOC_SOURCES} libcockatrice/deck_list/abstract_deck_list_card_node.cpp
-  libcockatrice/deck_list/abstract_deck_list_node.cpp libcockatrice/deck_list/deck_list.cpp
-  libcockatrice/deck_list/deck_list_card_node.cpp libcockatrice/deck_list/inner_deck_list_node.cpp
+  ${MOC_SOURCES}
+  libcockatrice/deck_list/abstract_deck_list_card_node.cpp
+  libcockatrice/deck_list/abstract_deck_list_node.cpp
+  libcockatrice/deck_list/deck_list.cpp
+  libcockatrice/deck_list/deck_list_card_node.cpp
+  libcockatrice/deck_list/deck_list_history_manager.cpp
+  libcockatrice/deck_list/inner_deck_list_node.cpp
 )
 
 add_dependencies(libcockatrice_deck_list libcockatrice_protocol)
diff --git a/libcockatrice_deck_list/libcockatrice/deck_list/deck_list_history_manager.cpp b/libcockatrice_deck_list/libcockatrice/deck_list/deck_list_history_manager.cpp
new file mode 100644
index 000000000..fe44d0eb8
--- /dev/null
+++ b/libcockatrice_deck_list/libcockatrice/deck_list/deck_list_history_manager.cpp
@@ -0,0 +1,48 @@
+#include "deck_list_history_manager.h"
+
+void DeckListHistoryManager::save(DeckListMemento *memento)
+{
+    undoStack.push(memento);
+    redoStack.clear();
+    emit undoRedoStateChanged();
+}
+
+void DeckListHistoryManager::undo(DeckList *deck)
+{
+    if (undoStack.isEmpty()) {
+        return;
+    }
+
+    // Peek at the memento we are going to restore
+    DeckListMemento *mementoToRestore = undoStack.top();
+
+    // Save current state for redo using the same reason as the memento we're restoring
+    DeckListMemento *currentState = deck->createMemento(mementoToRestore->getReason());
+    redoStack.push(currentState);
+
+    // Pop the last state from undo stack and restore it
+    DeckListMemento *memento = undoStack.pop();
+    deck->restoreMemento(memento);
+
+    emit undoRedoStateChanged();
+}
+
+void DeckListHistoryManager::redo(DeckList *deck)
+{
+    if (redoStack.isEmpty()) {
+        return;
+    }
+
+    // Peek at the memento we are going to restore
+    DeckListMemento *mementoToRestore = redoStack.top();
+
+    // Save current state for undo using the same reason as the memento we're restoring
+    DeckListMemento *currentState = deck->createMemento(mementoToRestore->getReason());
+    undoStack.push(currentState);
+
+    // Pop the next state from redo stack and restore it
+    DeckListMemento *memento = redoStack.pop();
+    deck->restoreMemento(memento);
+
+    emit undoRedoStateChanged();
+}
\ No newline at end of file
diff --git a/libcockatrice_deck_list/libcockatrice/deck_list/deck_list_history_manager.h b/libcockatrice_deck_list/libcockatrice/deck_list/deck_list_history_manager.h
index d8d0b473f..ca4a7e8dc 100644
--- a/libcockatrice_deck_list/libcockatrice/deck_list/deck_list_history_manager.h
+++ b/libcockatrice_deck_list/libcockatrice/deck_list/deck_list_history_manager.h
@@ -20,12 +20,7 @@ public:
     {
     }
 
-    void save(DeckListMemento *memento)
-    {
-        undoStack.push(memento);
-        redoStack.clear();
-        emit undoRedoStateChanged();
-    }
+    void save(DeckListMemento *memento);
 
     bool canUndo() const
     {
@@ -36,47 +31,9 @@ public:
         return !redoStack.isEmpty();
     }
 
-    DeckListMemento *undo(DeckList *deck)
-    {
-        if (undoStack.isEmpty()) {
-            return nullptr;
-        }
+    void undo(DeckList *deck);
 
-        // Peek at the memento we are going to restore
-        DeckListMemento *mementoToRestore = undoStack.top();
-
-        // Save current state for redo using the same reason as the memento we're restoring
-        DeckListMemento *currentState = deck->createMemento(mementoToRestore->getReason());
-        redoStack.push(currentState);
-
-        // Pop the last state from undo stack and restore it
-        DeckListMemento *memento = undoStack.pop();
-        deck->restoreMemento(memento);
-
-        emit undoRedoStateChanged();
-        return memento;
-    }
-
-    DeckListMemento *redo(DeckList *deck)
-    {
-        if (redoStack.isEmpty()) {
-            return nullptr;
-        }
-
-        // Peek at the memento we are going to restore
-        DeckListMemento *mementoToRestore = redoStack.top();
-
-        // Save current state for undo using the same reason as the memento we're restoring
-        DeckListMemento *currentState = deck->createMemento(mementoToRestore->getReason());
-        undoStack.push(currentState);
-
-        // Pop the next state from redo stack and restore it
-        DeckListMemento *memento = redoStack.pop();
-        deck->restoreMemento(memento);
-
-        emit undoRedoStateChanged();
-        return memento;
-    }
+    void redo(DeckList *deck);
 
     QStack<DeckListMemento *> getRedoStack() const
     {