diff --git a/.changeset/large-actors-worry.md b/.changeset/large-actors-worry.md
new file mode 100644
index 00000000000..8a632af6836
--- /dev/null
+++ b/.changeset/large-actors-worry.md
@@ -0,0 +1,5 @@
+---
+'@keystone-next/keystone': patch
+---
+
+Fixed Relationship field inline connect throwing 400 errors when selecting a value.
diff --git a/packages/keystone/src/fields/types/relationship/views/cards/index.tsx b/packages/keystone/src/fields/types/relationship/views/cards/index.tsx
index 209cd486dfa..5922fbe380f 100644
--- a/packages/keystone/src/fields/types/relationship/views/cards/index.tsx
+++ b/packages/keystone/src/fields/types/relationship/views/cards/index.tsx
@@ -310,7 +310,7 @@ export function Cards({
                     try {
                       const { data, errors } = await client.query({
                         query: gql`query ($ids: [ID!]!) {
-                      items: ${foreignList.gqlNames.listQueryName}(where: {id_in:$ids}) {
+                      items: ${foreignList.gqlNames.listQueryName}(where: { id: { in: $ids }}) {
                         ${selectedFields}
                       }
                     }`,