diff --git a/pitivi/ui/zoominterface.py b/pitivi/ui/zoominterface.py
index 4456715..446728d 100644
--- a/pitivi/ui/zoominterface.py
+++ b/pitivi/ui/zoominterface.py
@@ -109,6 +109,9 @@ class Zoomable(object):
 
     @classmethod
     def computeZoomLevel(cls, ratio):
+        if ratio <= cls.min_zoom:
+            return cls.max_zoom
+
         return int((((ratio - cls.min_zoom) / cls.zoom_range) ** (1.0/3.0)) *
             cls.zoom_steps)
 
