diff --git a/GeoPainter.cpp b/GeoPainterDIFF.cpp
--- a/GeoPainter.cpp
+++ b/GeoPainterDIFF.cpp
@@ -1023,7 +1023,7 @@
                                   const qreal fontSize, const QColor &color,
                                   const Frames &flags)
 {
-    const QString key = text + ":" + QString::number(static_cast<int>(flags));
+    const QString key = text + ':' + QString::number(static_cast<int>(flags));
 
     QPixmap pixmap;