diff --git a/qutebrowser/browser/webengine/webenginetab.py b/qutebrowser/browser/webengine/webenginetab.py
index 1c2488181..81f5604ad 100644
--- a/qutebrowser/browser/webengine/webenginetab.py
+++ b/qutebrowser/browser/webengine/webenginetab.py
@@ -258,11 +258,18 @@ class WebEngineScroller(browsertab.AbstractScroller):
             self._pos_px = QPoint(jsret['px']['x'], jsret['px']['y'])
 
             dx = jsret['scroll']['width'] - jsret['inner']['width']
-            perc_x = 0 if dx == 0 else round(100 / dx * jsret['px']['x'])
-            dy = jsret['scroll']['height'] - jsret['inner']['height']
-            perc_y = 0 if dy == 0 else round(100 / dy * jsret['px']['y'])
+            if dx == 0:
+                perc_x = 0
+            else:
+                perc_x = min(100, round(100 / dx * jsret['px']['x']))
 
-            self._at_bottom = dy == jsret['px']['y']
+            dy = jsret['scroll']['height'] - jsret['inner']['height']
+            if dy == 0:
+                perc_y = 0
+            else:
+                perc_y = min(100, round(100 / dy * jsret['px']['y']))
+
+            self._at_bottom = dy >= jsret['px']['y']
             self._pos_perc = perc_x, perc_y
 
             self.perc_changed.emit(*self._pos_perc)