diff --git a/swh/deposit/tests/data/atom/entry-data-with-metadata-provenance.xml b/swh/deposit/tests/data/atom/entry-data-with-metadata-provenance.xml
--- a/swh/deposit/tests/data/atom/entry-data-with-metadata-provenance.xml
+++ b/swh/deposit/tests/data/atom/entry-data-with-metadata-provenance.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0"?>
 <entry xmlns="http://www.w3.org/2005/Atom"
-       xmlns:schema="https://schema.org/"
+       xmlns:schema="http://schema.org/"
        xmlns:swh="https://www.softwareheritage.org/schema/2018/deposit">
     <title>Awesome stuff</title>
     <id>urn:uuid:1225c695-cfb8-4ebb-aaaa-80da344efa6a</id>
diff --git a/swh/deposit/tests/test_utils.py b/swh/deposit/tests/test_utils.py
--- a/swh/deposit/tests/test_utils.py
+++ b/swh/deposit/tests/test_utils.py
@@ -113,7 +113,7 @@
 def xml_swh_deposit_template():
     xml_data = """<?xml version="1.0"?>
   <entry xmlns:swh="https://www.softwareheritage.org/schema/2018/deposit"
-         xmlns:schema="https://schema.org/">
+         xmlns:schema="http://schema.org/">
       <swh:deposit>
         {swh_deposit}
       </swh:deposit>
diff --git a/swh/deposit/utils.py b/swh/deposit/utils.py
--- a/swh/deposit/utils.py
+++ b/swh/deposit/utils.py
@@ -24,7 +24,7 @@
         "https://doi.org/10.5063/SCHEMA/CODEMETA-2.0": "codemeta",
         "http://purl.org/net/sword/terms/": "sword",
         "https://www.softwareheritage.org/schema/2018/deposit": "swh",
-        "https://schema.org/": "schema",
+        "http://schema.org/": "schema",
     }
 
     data = xmltodict.parse(