diff --git a/mainwindow.ui b/mainwindow.ui
index 47737ebbc..a91a58c2d 100644
--- a/mainwindow.ui
+++ b/mainwindow.ui
@@ -748,7 +748,7 @@ QLabel[oob="true"] {
                       <item>
                        <widget class="QCheckBox" name="cbFirst">
                         <property name="toolTip">
-                         <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;Chect to call the first decoded responder to my CQ.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+                         <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;Check to call the first decoded responder to my CQ.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
                         </property>
                         <property name="text">
                          <string>Call 1st</string>