diff --git a/src/wellknown/qprotobufwellknowntypesjsonserializers.cpp b/src/wellknown/qprotobufwellknowntypesjsonserializers.cpp
index 5bd67ea5..d873c96b 100644
--- a/src/wellknown/qprotobufwellknowntypesjsonserializers.cpp
+++ b/src/wellknown/qprotobufwellknowntypesjsonserializers.cpp
@@ -10,6 +10,7 @@
 #include <QtProtobuf/private/qtprotobuflogging_p.h>
 
 #include <QtCore/qjsonvalue.h>
+#include <QtCore/qtimezone.h>
 
 QT_BEGIN_NAMESPACE