diff --git a/PIL/TiffImagePlugin.py b/PIL/TiffImagePlugin.py
index 18793982d..ee5bd098a 100644
--- a/PIL/TiffImagePlugin.py
+++ b/PIL/TiffImagePlugin.py
@@ -283,12 +283,16 @@ class IFDRational(Fraction):
     def __repr__(self):
         return str(float(self._val))
 
+    def __hash__(self):
+        return self._val.__hash__()
+
     def __eq__(self,other):
         if type(other) == float:
             return float(self) == other
         if type(other) == int:
             return float(self) == float(int(self)) and int(self) == other
         return float(self) == float(other)
+
     
 
 class ImageFileDirectory_v2(collections.MutableMapping):