diff --git a/kivy/uix/scrollview.py b/kivy/uix/scrollview.py
index 3216d81e6..77ca88e29 100644
--- a/kivy/uix/scrollview.py
+++ b/kivy/uix/scrollview.py
@@ -895,9 +895,10 @@ class ScrollView(StencilView):
                     and self.effect_x:
                 width = self.width
                 if touch.ud.get('in_bar_x', False):
-                    dx = touch.dx / float(width - width * self.hbar[1])
-                    self.scroll_x = min(max(self.scroll_x + dx, 0.), 1.)
-                    self._trigger_update_from_scroll()
+                    if self.hbar[1] != 1:
+                        dx = touch.dx / float(width - width * self.hbar[1])
+                        self.scroll_x = min(max(self.scroll_x + dx, 0.), 1.)
+                        self._trigger_update_from_scroll()
                 else:
                     if self.scroll_type != ['bars']:
                         self.effect_x.update(touch.x)