diff --git a/Tests/images/iss634.apng b/Tests/images/iss634.apng
new file mode 100644
index 000000000..89e025906
Binary files /dev/null and b/Tests/images/iss634.apng differ
diff --git a/Tests/test_file_png.py b/Tests/test_file_png.py
index ca7d3c039..b837732cf 100644
--- a/Tests/test_file_png.py
+++ b/Tests/test_file_png.py
@@ -335,6 +335,18 @@ class TestFilePng(PillowTestCase):
         im.load()
         self.assertRaises(RuntimeError, im.verify)
 
+    def test_apng_load_verify(self):
+        # Check open/load/verify exception (@PIL150)
+        TEST_APNG_FILE =  "Tests/images/iss634.apng"
+        im = Image.open(TEST_APNG_FILE)
+
+        # Assert that there is no unclosed file warning
+        self.assert_warning(None, im.verify)
+
+        im = Image.open(TEST_APNG_FILE)
+        im.load()
+        self.assertRaises(RuntimeError, im.verify)
+
     def test_verify_struct_error(self):
         # Check open/load/verify exception (#1755)
 
diff --git a/src/PIL/PngImagePlugin.py b/src/PIL/PngImagePlugin.py
index f780f811a..9a5d28bec 100644
--- a/src/PIL/PngImagePlugin.py
+++ b/src/PIL/PngImagePlugin.py
@@ -868,6 +868,6 @@ def getchunks(im, **params):
 Image.register_open(PngImageFile.format, PngImageFile, _accept)
 Image.register_save(PngImageFile.format, _save)
 
-Image.register_extension(PngImageFile.format, ".png")
+Image.register_extensions(PngImageFile.format, [".png", ".apng"])
 
 Image.register_mime(PngImageFile.format, "image/png")