diff --git a/kivy/uix/scrollview.py b/kivy/uix/scrollview.py
index 1e93e2ef0..8293bde23 100644
--- a/kivy/uix/scrollview.py
+++ b/kivy/uix/scrollview.py
@@ -106,7 +106,7 @@ class ScrollView(StencilView):
     def __init__(self, **kwargs):
         self._touch = False
         self._tdx = self._tdy = self._ts = self._tsn = 0
-        self._scroll_y_mouse = 0
+        self._scroll_y_mouse = 1
         super(ScrollView, self).__init__(**kwargs)
         self.bind(scroll_x=self.update_from_scroll,
                   scroll_y=self.update_from_scroll,