diff --git a/pygeoapi/api.py b/pygeoapi/api.py
index 103cac2..00f1160 100644
--- a/pygeoapi/api.py
+++ b/pygeoapi/api.py
@@ -1271,6 +1271,8 @@ class API:
 
             return headers, 200, content
 
+        headers['Content-Type'] = 'application/schema+json'
+
         return headers, 200, to_json(queryables, self.pretty_print)
 
     @gzip
diff --git a/tests/test_api.py b/tests/test_api.py
index 2ade9ab..ea2ae3c 100644
--- a/tests/test_api.py
+++ b/tests/test_api.py
@@ -536,6 +536,7 @@ def test_get_collection_queryables(config, api_):
 
     req = mock_request({'f': 'json'})
     rsp_headers, code, response = api_.get_collection_queryables(req, 'obs')
+    assert rsp_headers['Content-Type'] == 'application/schema+json'
     queryables = json.loads(response)
 
     assert 'properties' in queryables