diff --git a/src/calibre/gui2/viewer/config.ui b/src/calibre/gui2/viewer/config.ui
index b01a48b1e9..2256d32787 100644
--- a/src/calibre/gui2/viewer/config.ui
+++ b/src/calibre/gui2/viewer/config.ui
@@ -675,7 +675,7 @@ QToolBox::tab:hover {
             <item row="0" column="1">
              <widget class="QSpinBox" name="opt_wheel_scroll_fraction">
               <property name="toolTip">
-               <string>This is a percentage, by making itless than 100 you can decrease the amount the wheel scrolls by, by making it more than 100 you can increase the scroll amount.</string>
+               <string>This is a percentage, by making it less than 100 you can decrease the amount the wheel scrolls by, by making it more than 100 you can increase the scroll amount.</string>
               </property>
               <property name="suffix">
                <string> %</string>
@@ -704,7 +704,7 @@ QToolBox::tab:hover {
             <item row="1" column="1">
              <widget class="QSpinBox" name="opt_line_scroll_fraction">
               <property name="toolTip">
-               <string>This is a percentage, by making itless than 100 you can decrease the amount thearrow keys scroll by, by making it more than 100 you can increase the scroll amount.</string>
+               <string>This is a percentage, by making it less than 100 you can decrease the amount thearrow keys scroll by, by making it more than 100 you can increase the scroll amount.</string>
               </property>
               <property name="suffix">
                <string> %</string>