diff --git a/core/CsvWriter.h b/core/CsvWriter.h
index da48a4a..efb4a39 100644
--- a/core/CsvWriter.h
+++ b/core/CsvWriter.h
@@ -2,6 +2,7 @@
 #define CSVWRITER_H
 
 #include <ostream>
+#include <QString>
 #include <QTextStream>
 
 class CsvWriter {