diff --git a/src/declarativeimports/plasmacomponents/units.cpp b/src/declarativeimports/plasmacomponents/units.cpp
index 1db014e62..6b7c76a2d 100644
--- a/src/declarativeimports/plasmacomponents/units.cpp
+++ b/src/declarativeimports/plasmacomponents/units.cpp
@@ -68,7 +68,7 @@ qreal Units::gu(qreal value) const
 
 void Units::themeChanged()
 {
-    const int gridUnit = QFontMetrics(QApplication::font()).boundingRect("M").width();
+    const int gridUnit = QFontMetrics(QApplication::font()).boundingRect("M").height();
     qDebug() << "FontMetrics: " << QApplication::font().pixelSize() << QFontMetrics(QApplication::font()).boundingRect("M");
     qDebug() << " MRect" << QFontMetrics(QApplication::font()).boundingRect("M").size();
     qDebug() << " like spacing" << QFontMetrics(QApplication::font()).boundingRect("M").size().height();