diff --git a/electrum/gui/qt/paytoedit.py b/electrum/gui/qt/paytoedit.py
index 01a8069cf..166907c61 100644
--- a/electrum/gui/qt/paytoedit.py
+++ b/electrum/gui/qt/paytoedit.py
@@ -216,7 +216,7 @@ def paytomany(self):
     def update_size(self):
         lineHeight = QFontMetrics(self.document().defaultFont()).height()
         docHeight = self.document().size().height()
-        h = docHeight * lineHeight + 11
+        h = round(docHeight * lineHeight + 11)
         h = min(max(h, self.heightMin), self.heightMax)
         self.setMinimumHeight(h)
         self.setMaximumHeight(h)