diff --git a/schemas/base-metadata.schema.ts b/schemas/base-metadata.schema.ts
index 062d1a232..419ca5a40 100644
--- a/schemas/base-metadata.schema.ts
+++ b/schemas/base-metadata.schema.ts
@@ -176,7 +176,7 @@ export const preprocessMetadataSchema = (schema: any = baseMetadataSchema, globa
 
     if (ophys) {
 
-        ophys.required = Object.keys(ophys.properties)
+        ophys.required = Object.keys(ophys.properties).filter(prop => prop !== 'definitions')
 
         const getProp = (name: string) => ophys.properties[name]