diff --git a/schemas/activity/MRIAcquisition.schema.tpl.json b/schemas/activity/MRIAcquisition.schema.tpl.json
index 90405b7..1302691 100644
--- a/schemas/activity/MRIAcquisition.schema.tpl.json
+++ b/schemas/activity/MRIAcquisition.schema.tpl.json
@@ -9,7 +9,7 @@
   "properties": {
     "contrastAgent": {
       "_instruction": "Add the contrast agent(s) administered for this acquisition, including for each the agent identity and administered amount; if no contrast agent was used, leave this field null. Include all agents given prior to or during the scan.",
-      "_linkedTypes": [
+      "_embeddedTypes": [
         "chemicals:AmountOfChemical"
       ],
       "minItems": 1,