diff --git a/src/Mod/AddonManager/developer_mode_edit_dependency.ui b/src/Mod/AddonManager/developer_mode_edit_dependency.ui
index 07b0b46dee..a70cbc0d5b 100644
--- a/src/Mod/AddonManager/developer_mode_edit_dependency.ui
+++ b/src/Mod/AddonManager/developer_mode_edit_dependency.ui
@@ -66,7 +66,7 @@
    <item row="2" column="0" colspan="2">
     <widget class="QCheckBox" name="optionalCheckBox">
      <property name="toolTip">
-      <string>If this is an optional dependency, the Addon Manager will offer to install it (when possible), but will not block installation if the user chooses not to, or cannot, instal the package.</string>
+      <string>If this is an optional dependency, the Addon Manager will offer to install it (when possible), but will not block installation if the user chooses not to, or cannot, install the package.</string>
      </property>
      <property name="text">
       <string>Optional</string>