diff --git a/src/mkvtoolnix-gui/forms/chapter_editor/mass_modification_dialog.ui b/src/mkvtoolnix-gui/forms/chapter_editor/mass_modification_dialog.ui
index 5310ffc60..b6dc40be7 100644
--- a/src/mkvtoolnix-gui/forms/chapter_editor/mass_modification_dialog.ui
+++ b/src/mkvtoolnix-gui/forms/chapter_editor/mass_modification_dialog.ui
@@ -56,7 +56,7 @@
      <item row="1" column="0">
       <widget class="QCheckBox" name="cbSetLanguage">
        <property name="text">
-        <string>Set the chapter names's &amp;languages:</string>
+        <string>Set the chapter names' &amp;languages:</string>
        </property>
       </widget>
      </item>
@@ -66,7 +66,7 @@
      <item row="2" column="0">
       <widget class="QCheckBox" name="cbSetCountry">
        <property name="text">
-        <string>Set the chapter names's co&amp;untries</string>
+        <string>Set the chapter names' co&amp;untries</string>
        </property>
       </widget>
      </item>
diff --git a/src/mkvtoolnix-gui/header_editor/tab.cpp b/src/mkvtoolnix-gui/header_editor/tab.cpp
index 3616bedda..da7874a0b 100644
--- a/src/mkvtoolnix-gui/header_editor/tab.cpp
+++ b/src/mkvtoolnix-gui/header_editor/tab.cpp
@@ -269,7 +269,7 @@ Tab::retranslateUi() {
   m_removeAttachmentAction->setText(QY("&Remove selected attachment"));
   m_saveAttachmentContentAction->setText(QY("Save attachment content to a &file"));
   m_replaceAttachmentContentAction->setText(QY("Replace attachment with a new &file"));
-  m_replaceAttachmentContentSetValuesAction->setText(QY("Replace attachment with new a file and &derive name && MIME type from it"));
+  m_replaceAttachmentContentSetValuesAction->setText(QY("Replace attachment with a new file and &derive name && MIME type from it"));
 
   m_addAttachmentsAction->setIcon(QIcon{Q(":/icons/16x16/list-add.png")});
   m_removeAttachmentAction->setIcon(QIcon{Q(":/icons/16x16/list-remove.png")});