diff --git a/PIL/SpiderImagePlugin.py b/PIL/SpiderImagePlugin.py
index 6344a1540..0ce63002b 100644
--- a/PIL/SpiderImagePlugin.py
+++ b/PIL/SpiderImagePlugin.py
@@ -50,6 +50,8 @@ def isInt(f):
             return 0
     except ValueError:
         return 0
+    except OverflowError:
+        return 0
 
 iforms = [1, 3, -11, -12, -21, -22]
 
diff --git a/Tests/images/invalid.spider b/Tests/images/invalid.spider
new file mode 100644
index 000000000..c6b024d6e
Binary files /dev/null and b/Tests/images/invalid.spider differ
diff --git a/Tests/test_file_spider.py b/Tests/test_file_spider.py
index 1ddecd365..8bd648e78 100644
--- a/Tests/test_file_spider.py
+++ b/Tests/test_file_spider.py
@@ -80,6 +80,11 @@ class TestImageSpider(PillowTestCase):
         # Assert
         self.assertEqual(ret, 0)
 
+    def test_invalid_file(self):
+        invalid_file = "Tests/images/invalid.spider"
+        
+        self.assertRaises(IOError, lambda: Image.open(invalid_file))
+
 
 if __name__ == '__main__':
     unittest.main()