diff --git a/src/collections/dataloader.ts b/src/collections/dataloader.ts
index 4906b83a00..67259e0fb7 100644
--- a/src/collections/dataloader.ts
+++ b/src/collections/dataloader.ts
@@ -54,12 +54,16 @@ const batchAndLoadDocs = (req: PayloadRequest): BatchLoadFn<string, TypeWithID>
 
     const idField = payload.collections?.[collection].config.fields.find((field) => fieldAffectsData(field) && field.name === 'id');
 
-    if (isValidID(id, getIDType(idField))) {
+    let sanitizedID: string | number = id
+
+    if (idField?.type === 'number') sanitizedID = parseFloat(id)
+
+    if (isValidID(sanitizedID, getIDType(idField))) {
       return {
         ...batches,
         [batchKey]: [
           ...batches[batchKey] || [],
-          id,
+          sanitizedID,
         ],
       };
     }
diff --git a/src/graphql/schema/buildObjectType.ts b/src/graphql/schema/buildObjectType.ts
index 805701be25..5fb6dee3ac 100644
--- a/src/graphql/schema/buildObjectType.ts
+++ b/src/graphql/schema/buildObjectType.ts
@@ -389,8 +389,6 @@ function buildObjectType({
           }
 
           if (id) {
-            id = id.toString();
-
             const relatedDocument = await context.req.payloadDataLoader.load(JSON.stringify([
               relatedCollectionSlug,
               id,
diff --git a/test/collections-graphql/config.ts b/test/collections-graphql/config.ts
index b425cb5c72..842fccc334 100644
--- a/test/collections-graphql/config.ts
+++ b/test/collections-graphql/config.ts
@@ -64,6 +64,11 @@ export default buildConfig({
           type: 'relationship',
           relationTo: relationSlug,
         },
+        {
+          name: 'relationToCustomID',
+          type: 'relationship',
+          relationTo: 'custom-ids',
+        },
         // Relation hasMany
         {
           name: 'relationHasManyField',
@@ -86,10 +91,26 @@ export default buildConfig({
         },
       ],
     },
+    {
+      slug: 'custom-ids',
+      access: {
+        read: () => true,
+      },
+      fields: [
+        {
+          name: 'id',
+          type: 'number',
+        },
+        {
+          name: 'title',
+          type: 'text',
+        },
+      ],
+    },
     collectionWithName(relationSlug),
     collectionWithName('dummy'),
   ],
-  onInit: async (payload) => {
+  onInit: async payload => {
     await payload.create({
       collection: 'users',
       data: {
@@ -98,12 +119,29 @@ export default buildConfig({
       },
     });
 
+    await payload.create({
+      collection: 'custom-ids',
+      data: {
+        id: 1,
+        title: 'hello',
+      },
+    });
+
+    await payload.create({
+      collection: slug,
+      data: {
+        title: 'has custom ID relation',
+        relationToCustomID: 1,
+      },
+    });
+
     await payload.create({
       collection: slug,
       data: {
         title: 'post1',
       },
     });
+
     await payload.create({
       collection: slug,
       data: {
diff --git a/test/collections-graphql/int.spec.ts b/test/collections-graphql/int.spec.ts
index 4dbffcaabb..600f761aed 100644
--- a/test/collections-graphql/int.spec.ts
+++ b/test/collections-graphql/int.spec.ts
@@ -364,6 +364,29 @@ describe('collections-graphql', () => {
         expect(docs).toContainEqual(expect.objectContaining({ id: specialPost.id }));
       });
     });
+
+    describe('relationships', () => {
+      it('should query on relationships with custom IDs', async () => {
+        const query = `query {
+          Posts(where: { title: { equals: "has custom ID relation" }}) {
+            docs {
+              id
+              title
+              relationToCustomID {
+                id
+              }
+            }
+            totalDocs
+          }
+        }`;
+
+        const response = await client.request(query);
+        const { docs, totalDocs } = response.Posts;
+
+        expect(totalDocs).toStrictEqual(1);
+        expect(docs[0].relationToCustomID.id).toStrictEqual(1);
+      });
+    });
   });
 
   describe('Error Handler', () => {