diff --git a/src/common/QskBoxBorderMetrics.cpp b/src/common/QskBoxBorderMetrics.cpp
index c7fd627c..63e4622a 100644
--- a/src/common/QskBoxBorderMetrics.cpp
+++ b/src/common/QskBoxBorderMetrics.cpp
@@ -101,7 +101,7 @@ QDebug operator<<( QDebug debug, const QskBoxBorderMetrics& metrics )
     debug.nospace();
 
     debug << "BoxBorder" << '(';
-    debug << metrics.sizeMode() << metrics.widths();
+    debug << metrics.sizeMode() << ',' << metrics.widths();
     debug << ')';
 
     return debug;