diff --git a/src/calibre/gui2/tweak_book/ui.py b/src/calibre/gui2/tweak_book/ui.py
index 0ce8f2f59c..281d3df3d5 100644
--- a/src/calibre/gui2/tweak_book/ui.py
+++ b/src/calibre/gui2/tweak_book/ui.py
@@ -76,6 +76,7 @@ class Central(QStackedWidget):  # {{{
         c.setLayout(l)
         l.setContentsMargins(0, 0, 0, 0)
         self.editor_tabs = t = QTabWidget(c)
+        self.editor_tabs.setStyleSheet('QTabBar::tab:selected { font-style: italic }')
         l.addWidget(t)
         t.setDocumentMode(True)
         t.setTabsClosable(True)