diff --git a/nw/gui/doceditor.py b/nw/gui/doceditor.py
index d3b6eb93..fadd6dd5 100644
--- a/nw/gui/doceditor.py
+++ b/nw/gui/doceditor.py
@@ -333,7 +333,7 @@ class GuiDocEditor(QTextEdit):
         else:
             tM = cM
 
-        tB = self.lineWidth()
+        tB = self.frameWidth()
         tW = self.width() - 2*tB - sW
         tH = self.docTitle.height()
         tT = cM - tH
diff --git a/nw/gui/docviewer.py b/nw/gui/docviewer.py
index 0648111b..42332fb5 100644
--- a/nw/gui/docviewer.py
+++ b/nw/gui/docviewer.py
@@ -230,7 +230,7 @@ class GuiDocViewer(QTextBrowser):
         else:
             sW = 0
 
-        tB = self.lineWidth()
+        tB = self.frameWidth()
         tW = self.width() - 2*tB - sW
         tH = self.docTitle.height()
         fH = self.docFooter.height()