diff --git a/analysis/codelists.py b/analysis/codelists.py
index 1e179f5..0975609 100644
--- a/analysis/codelists.py
+++ b/analysis/codelists.py
@@ -3754,13 +3754,13 @@
 
 hrg_LE01 = codelist_from_csv(
     "local_codelists/hrg_LE01.csv",
-    system="opcs",
+    system="opcs4",
     column="code",
 )
 
 hrg_LE02 = codelist_from_csv(
     "local_codelists/hrg_LE02.csv",
-    system="opcs",
+    system="opcs4",
     column="code",
 )