diff --git a/PIL/Image.py b/PIL/Image.py
index 7c17a1682..f6aeb7c3c 100644
--- a/PIL/Image.py
+++ b/PIL/Image.py
@@ -598,7 +598,7 @@ class Image:
             id(self)
             )
 
-    def _repr_png(self):
+    def _repr_png_(self):
         """ iPython display hook support
         
         :returns: png version of the image as bytes
diff --git a/Tests/test_file_png.py b/Tests/test_file_png.py
index da5f73a0e..4cd5dc703 100644
--- a/Tests/test_file_png.py
+++ b/Tests/test_file_png.py
@@ -377,7 +377,7 @@ class TestFilePng(PillowTestCase):
     def test_repr_png(self):
         im = hopper()
 
-        repr_png = Image.open(BytesIO(im._repr_png()))
+        repr_png = Image.open(BytesIO(im._repr_png_()))
         self.assertEqual(repr_png.format, 'PNG')
         self.assert_image_equal(im, repr_png)