diff --git a/src/PIL/JpegImagePlugin.py b/src/PIL/JpegImagePlugin.py
index 8efa97740..9fcb08d64 100644
--- a/src/PIL/JpegImagePlugin.py
+++ b/src/PIL/JpegImagePlugin.py
@@ -479,7 +479,7 @@ def _fixup(value):
 
 
 class ExifImageFileDirectory(TiffImagePlugin.ImageFileDirectory_v1):
-    '''
+    """
     Specialization for parsing EXIF data:
     - Remove support for v2 to avoid useless computations
     - custom __setitem__ to supports IFD values