diff --git a/utils/fgqcanvas/fgcanvaspath.cpp b/utils/fgqcanvas/fgcanvaspath.cpp
index c6f9cd210..7bd9f38a8 100644
--- a/utils/fgqcanvas/fgcanvaspath.cpp
+++ b/utils/fgqcanvas/fgcanvaspath.cpp
@@ -1,5 +1,7 @@
 #include "fgcanvaspath.h"
 
+#include <cctype>
+
 #include <QPainter>
 #include <QDebug>
 #include <QtMath>