diff --git a/src/GUI/powergraphitem.cpp b/src/GUI/powergraphitem.cpp
index 66e2eedb..3a4f04f0 100644
--- a/src/GUI/powergraphitem.cpp
+++ b/src/GUI/powergraphitem.cpp
@@ -18,9 +18,9 @@ QString PowerGraphItem::toolTip() const
 	ToolTip tt;
 
 	tt.insert(tr("Maximum"), QString::number(max(), 'f', 1)
-	  + UNIT_SPACE + tr("1/min"));
+	  + UNIT_SPACE + tr("W"));
 	tt.insert(tr("Average"), QString::number(avg(), 'f', 1)
-	  + UNIT_SPACE + tr("1/min"));
+	  + UNIT_SPACE + tr("W"));
 
 	return tt.toString();
 }