diff --git a/src/PIL/TiffImagePlugin.py b/src/PIL/TiffImagePlugin.py
index 66b211cbf..c1a785ef3 100644
--- a/src/PIL/TiffImagePlugin.py
+++ b/src/PIL/TiffImagePlugin.py
@@ -567,6 +567,9 @@ class ImageFileDirectory_v2(MutableMapping):
         if self.tagtype[tag] == 7 and py3:
             values = [value.encode("ascii", 'replace') if isinstance(
                       value, str) else value]
+        elif self.tagtype[tag] == 5:
+            values = [float(v) if isinstance(v, int) else v
+                      for v in values]
 
         values = tuple(info.cvt_enum(value) for value in values)