diff --git a/sigal/image.py b/sigal/image.py
index bcf4bf2..d46ca71 100644
--- a/sigal/image.py
+++ b/sigal/image.py
@@ -36,6 +36,7 @@ import PIL
 import pilkit.processors
 import sys
 import warnings
+import fractions
 
 from copy import deepcopy
 from datetime import datetime
@@ -254,7 +255,8 @@ def get_exif_tags(data):
         exptime = data['ExposureTime']
         if isinstance(exptime, tuple):
             try:
-                simple['exposure'] = exptime[0] / float(exptime[1])
+                simple['exposure'] = str(fractions.Fraction(exptime[0],
+                                                            exptime[1]))
             except IndexError:
                 # Pillow == 3.0
                 simple['exposure'] = exptime[0]
diff --git a/tests/conftest.py b/tests/conftest.py
index 85c7b32..052eb6d 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,6 +1,7 @@
 # -*- coding: utf-8 -*-
 
 import os
+import PIL
 import pytest
 
 from sigal.settings import read_settings
@@ -12,3 +13,7 @@ CURRENT_DIR = os.path.abspath(os.path.dirname(__file__))
 def settings():
     """Read the sample config file."""
     return read_settings(os.path.join(CURRENT_DIR, 'sample', 'sigal.conf.py'))
+
+
+def pytest_report_header(config):
+    return "project deps: Pillow-{}".format(PIL.PILLOW_VERSION)
diff --git a/tests/test_image.py b/tests/test_image.py
index 224cb4f..df0cedc 100644
--- a/tests/test_image.py
+++ b/tests/test_image.py
@@ -1,6 +1,7 @@
 # -*- coding:utf-8 -*-
 
 import os
+import PIL
 import pytest
 from PIL import Image
 
@@ -104,7 +105,10 @@ def test_get_exif_tags():
     assert simple['iso'] == 50
     assert simple['Make'] == 'NIKON'
     assert simple['datetime'] == 'Sunday, 22. January 2006'
-    assert simple['exposure'] == 0.00100603
+    if PIL.PILLOW_VERSION == '3.0.0':
+        assert simple['exposure'] == 0.00100603
+    else:
+        assert simple['exposure'] == '100603/100000000'
 
     data = {'FNumber': [1, 0], 'FocalLength': [1, 0], 'ExposureTime': 10}
     simple = get_exif_tags(data)
@@ -142,7 +146,8 @@ def test_exif_copy(tmpdir):
     assert not simple
 
 
-@pytest.mark.xfail
+@pytest.mark.xfail(PIL.PILLOW_VERSION == '3.0.0',
+                   reason="Pillow 3.0.0 was broken")
 def test_exif_gps(tmpdir):
     """Test reading out correct geo tags"""
 
diff --git a/tox.ini b/tox.ini
index 946bfe4..bfe256a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,9 +1,11 @@
 [tox]
-envlist = py27,py33,py34,py35,report,check
+envlist = py{27,33,34,35}-pillow{30,31},report,check
 
 [testenv]
 commands = py.test --cov sigal --cov-report term-missing
 deps =
+    pillow30: Pillow==3.0.0
+    pillow31: Pillow>3.0.0
     pytest
     pytest-capturelog
     pytest-cov