diff --git a/src/modules/locale/timezonewidget/TimeZoneImage.cpp b/src/modules/locale/timezonewidget/TimeZoneImage.cpp
index e5f0ff552..7f50e63de 100644
--- a/src/modules/locale/timezonewidget/TimeZoneImage.cpp
+++ b/src/modules/locale/timezonewidget/TimeZoneImage.cpp
@@ -33,6 +33,8 @@ static_assert( TimeZoneImageList::zoneCount == ( sizeof( zoneNames ) / sizeof( z
 
 #define ZONE_NAME QStringLiteral( "zone" )
 
+/* static constexpr */ const int TimeZoneImageList::zoneCount;
+
 TimeZoneImageList::TimeZoneImageList() {}
 
 TimeZoneImageList