diff --git a/oslo_utils/imageutils.py b/oslo_utils/imageutils.py
index 48080913..e3951d18 100644
--- a/oslo_utils/imageutils.py
+++ b/oslo_utils/imageutils.py
@@ -100,7 +100,7 @@ class QemuImgInfo(object):
         if self.encrypted:
             lines.append("encrypted: %s" % self.encrypted)
         if self.format_specific:
-            lines.appened("format_specific: %s" % self.format_specific)
+            lines.append("format_specific: %s" % self.format_specific)
         return "\n".join(lines)
 
     def _canonicalize(self, field):
diff --git a/oslo_utils/tests/test_imageutils.py b/oslo_utils/tests/test_imageutils.py
index 5705ca8a..952e0675 100644
--- a/oslo_utils/tests/test_imageutils.py
+++ b/oslo_utils/tests/test_imageutils.py
@@ -264,6 +264,9 @@ class ImageUtilsJSONTestCase(test_base.BaseTestCase):
         self.assertEqual(13168640, image_info.disk_size)
         self.assertEqual("bar", image_info.format_specific["data"]["foo"])
         self.assertEqual('yes', image_info.encrypted)
+        # test for Bug #1996426
+        expected_str = "format_specific: {'data': {'foo': 'bar'}}"
+        self.assertIn(expected_str, str(image_info))
 
     @mock.patch("debtcollector.deprecate")
     def test_qemu_img_info_blank(self, mock_deprecate):