diff --git a/schema/crdb/38.0.0/up01.sql b/schema/crdb/38.0.0/up01.sql
index eee0f31f0a..44165abe93 100644
--- a/schema/crdb/38.0.0/up01.sql
+++ b/schema/crdb/38.0.0/up01.sql
@@ -9,5 +9,5 @@ CREATE TABLE IF NOT EXISTS omicron.public.inv_physical_disk (
 
     variant omicron.public.physical_disk_kind NOT NULL,
 
-    PRIMARY KEY (inv_collection_id, sled_id, vendor, serial, model)
+    PRIMARY KEY (inv_collection_id, sled_id, vendor, model, serial)
 );