diff --git a/sdrbase/util/callsign.h b/sdrbase/util/callsign.h
index 288a04872..ffff9fa6b 100644
--- a/sdrbase/util/callsign.h
+++ b/sdrbase/util/callsign.h
@@ -24,9 +24,10 @@
 #include <QObject>
 #include <QRegularExpression>
 
+#include "export.h"
 #include "countrydat.h"
 
-class Callsign : public QObject
+class SDRBASE_API Callsign : public QObject
 {
     Q_OBJECT
 
diff --git a/sdrbase/util/countrydat.h b/sdrbase/util/countrydat.h
index f50f00352..482500eb5 100644
--- a/sdrbase/util/countrydat.h
+++ b/sdrbase/util/countrydat.h
@@ -34,7 +34,9 @@
 #include <QHash>
 #include <QDate>
 
-class CountryDat
+#include "export.h"
+
+class SDRBASE_API CountryDat
 {
 public:
     struct CountryInfo {