diff --git a/changelogs/client_server/newsfragments/1947.clarification b/changelogs/client_server/newsfragments/1947.clarification
new file mode 100644
index 000000000..3764243a2
--- /dev/null
+++ b/changelogs/client_server/newsfragments/1947.clarification
@@ -0,0 +1 @@
+Correct OpenAPI specification for query parameters to `GET /_matrix/client/v3/thirdparty/location/{protocol}` endpoint.
diff --git a/data/api/client-server/third_party_lookup.yaml b/data/api/client-server/third_party_lookup.yaml
index 97547a6fc..3055b8aec 100644
--- a/data/api/client-server/third_party_lookup.yaml
+++ b/data/api/client-server/third_party_lookup.yaml
@@ -98,12 +98,14 @@ paths:
           schema:
             type: string
         - in: query
-          name: searchFields
+          name: fields
           description: |-
             One or more custom fields to help identify the third-party
             location.
           schema:
-            type: string
+            type: object
+            additionalProperties:
+              type: string
       responses:
         "200":
           description: At least one portal room was found.