diff --git a/src/frontends/qt4/ui/FontUi.ui b/src/frontends/qt4/ui/FontUi.ui
index 3c0e14c094..416c3fbc65 100644
--- a/src/frontends/qt4/ui/FontUi.ui
+++ b/src/frontends/qt4/ui/FontUi.ui
@@ -258,7 +258,7 @@
    <item row="10" column="1">
     <widget class="QCheckBox" name="microtypeCB">
      <property name="toolTip">
-      <string>Activate extensions such as character protusion and font expansion via the microtype package</string>
+      <string>Activate extensions such as character protrusion and font expansion via the microtype package</string>
      </property>
      <property name="text">
       <string>Enable micr&amp;o-typographic extensions</string>