diff --git a/openprescribing/dmd/search.py b/openprescribing/dmd/search.py
index 18ca2feef7..dd983cf6ff 100644
--- a/openprescribing/dmd/search.py
+++ b/openprescribing/dmd/search.py
@@ -68,7 +68,7 @@ def search_by_gtin(q):
         return []
 
     try:
-        obj = GTIN.objects.select_related("AMPP").get(gtin=q)
+        obj = GTIN.objects.select_related("ampp").get(gtin=q)
     except AMPP.DoesNotExist:
         return []