diff --git a/libcockatrice_deck_list/libcockatrice/deck_list/deck_list.cpp b/libcockatrice_deck_list/libcockatrice/deck_list/deck_list.cpp
index dcc3a69e5..fad4d052a 100644
--- a/libcockatrice_deck_list/libcockatrice/deck_list/deck_list.cpp
+++ b/libcockatrice_deck_list/libcockatrice/deck_list/deck_list.cpp
@@ -8,6 +8,7 @@
 #include <QCryptographicHash>
 #include <QFile>
 #include <QRegularExpression>
+#include <QSet>
 #include <QTextStream>
 #include <algorithm>