diff --git a/libcockatrice_card/libcockatrice/card/set/card_set.cpp b/libcockatrice_card/libcockatrice/card/set/card_set.cpp
index 5cbbdd724..44ae3ad8e 100644
--- a/libcockatrice_card/libcockatrice/card/set/card_set.cpp
+++ b/libcockatrice_card/libcockatrice/card/set/card_set.cpp
@@ -1,5 +1,6 @@
 #include "card_set.h"
 
+#include <QSet>
 #include <utility>
 
 const char *CardSet::TOKENS_SETNAME = "TK";