diff --git a/data/api/application-service/protocols.yaml b/data/api/application-service/protocols.yaml
index 59dff5b0..c8ef4033 100644
--- a/data/api/application-service/protocols.yaml
+++ b/data/api/application-service/protocols.yaml
@@ -101,7 +101,9 @@ paths:
             One or more custom fields that are passed to the application
             service to help identify the user.
           schema:
-            type: string
+            type: object
+            additionalProperties:
+              type: string
       responses:
         "200":
           description: The Matrix User IDs found with the given parameters.
@@ -166,7 +168,9 @@ paths:
             One or more custom fields that are passed to the application
             service 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.
diff --git a/data/api/client-server/third_party_lookup.yaml b/data/api/client-server/third_party_lookup.yaml
index de1b0b63..be07e5c3 100644
--- a/data/api/client-server/third_party_lookup.yaml
+++ b/data/api/client-server/third_party_lookup.yaml
@@ -143,7 +143,9 @@ paths:
           description: One or more custom fields that are passed to the AS to help
             identify the user.
           schema:
-            type: string
+            type: object
+            additionalProperties:
+              type: string
       responses:
         "200":
           description: The Matrix User IDs found with the given parameters.