diff --git a/cockatrice/src/interface/widgets/server/user/user_info_box.h b/cockatrice/src/interface/widgets/server/user/user_info_box.h
index 8ad12f226..75a16223e 100644
--- a/cockatrice/src/interface/widgets/server/user/user_info_box.h
+++ b/cockatrice/src/interface/widgets/server/user/user_info_box.h
@@ -40,6 +40,7 @@ private:
 public:
     UserInfoBox(AbstractClient *_client, bool editable, QWidget *parent = nullptr, Qt::WindowFlags flags = {});
     void retranslateUi();
+
 private slots:
     void processResponse(const Response &r);
     void processEditResponse(const Response &r);
diff --git a/libcockatrice_utility/CMakeLists.txt b/libcockatrice_utility/CMakeLists.txt
index c0c7d8cc9..df29d6c9f 100644
--- a/libcockatrice_utility/CMakeLists.txt
+++ b/libcockatrice_utility/CMakeLists.txt
@@ -17,6 +17,7 @@ set(UTILITY_HEADERS
     libcockatrice/utility/passwordhasher.h
     libcockatrice/utility/trice_limits.h
     libcockatrice/utility/zone_names.h
+    libcockatrice/utility/days_years_between.h
 )
 
 add_library(libcockatrice_utility STATIC ${UTILITY_SOURCES} ${UTILITY_HEADERS})
diff --git a/libcockatrice_utility/libcockatrice/utility/days_years_between.h b/libcockatrice_utility/libcockatrice/utility/days_years_between.h
index c0f5da23a..4b3b5bc0c 100644
--- a/libcockatrice_utility/libcockatrice/utility/days_years_between.h
+++ b/libcockatrice_utility/libcockatrice/utility/days_years_between.h
@@ -1,3 +1,6 @@
+#ifndef COCKATRICE_DAYS_YEARS_BETWEEN_H
+#define COCKATRICE_DAYS_YEARS_BETWEEN_H
+
 #include <QDateTime>
 
 inline static QPair<int, int> getDaysAndYearsBetween(const QDate &then, const QDate &now)
@@ -6,3 +9,5 @@ inline static QPair<int, int> getDaysAndYearsBetween(const QDate &then, const QD
     int days = then.addYears(years).daysTo(now);
     return {days, years};
 }
+
+#endif // COCKATRICE_DAYS_YEARS_BETWEEN_H