diff --git a/pixelocr/page.py b/pixelocr/page.py
index 1ec8537..51e2599 100644
--- a/pixelocr/page.py
+++ b/pixelocr/page.py
@@ -202,6 +202,8 @@ class Glyph(PageObject):
 
         if glyph.elevation < self.DIACRITIC_MIN_ELEVATION:
             return 0
+        if glyph.top >= self.top:
+            return 0
         if (
             glyph.left < self.left - self.DIACRITIC_WINDOW_LEFT
             or glyph.right > self.right + self.DIACRITIC_WINDOW_RIGHT