diff --git a/packages/backend/src/server/api/openapi/schemas.ts b/packages/backend/src/server/api/openapi/schemas.ts
index 0b9eb4fe2..1a1d973e5 100644
--- a/packages/backend/src/server/api/openapi/schemas.ts
+++ b/packages/backend/src/server/api/openapi/schemas.ts
@@ -26,7 +26,12 @@ export function convertSchemaToOpenApiSchema(schema: Schema) {
 	if (schema.allOf) res.allOf = schema.allOf.map(convertSchemaToOpenApiSchema);
 
 	if (schema.ref) {
-		res.$ref = `#/components/schemas/${schema.ref}`;
+		const $ref = `#/components/schemas/${schema.ref}`;
+		if (schema.nullable || schema.optional) {
+			res.allOf = [{ $ref }];
+		} else {
+			res.$ref = $ref;
+		}
 	}
 
 	return res;