diff --git a/c2pa/c2pa_api/c2pa_api.py b/c2pa/c2pa_api/c2pa_api.py
index 26fecd86..ec097e92 100644
--- a/c2pa/c2pa_api/c2pa_api.py
+++ b/c2pa/c2pa_api/c2pa_api.py
@@ -39,7 +39,7 @@ class Reader(api.Reader):
     def __init__(self, format, stream, manifest_data=None):
         super().__init__()
         if manifest_data is not None:
-            self.from_manifest_data_and_stream(format, manifest_data, stream)
+            self.from_manifest_data_and_stream(manifest_data, format, stream)
         else:
             self.from_stream(format, C2paStream(stream))
 
diff --git a/tests/unit_tests.py b/tests/test_unit_tests.py
similarity index 97%
rename from tests/unit_tests.py
rename to tests/test_unit_tests.py
index e3c8c940..583eecc7 100644
--- a/tests/unit_tests.py
+++ b/tests/test_unit_tests.py
@@ -121,7 +121,7 @@ def test_remote_sign(self):
             output = io.BytesIO(bytearray())
             manifest_data = builder.sign(TestBuilder.signer, "image/jpeg", file, output)
             output.seek(0)
-            reader = Reader.from_manifest_data_and_stream(manifest_data, "image/jpeg", output)
+            reader = Reader("image/jpeg", output, manifest_data)
             self.assertIn("Python Test", reader.json())
 
 if __name__ == '__main__':