diff --git a/c_gen/templates/loci_validator.c b/c_gen/templates/loci_validator.c
index db99336..0086016 100644
--- a/c_gen/templates/loci_validator.c
+++ b/c_gen/templates/loci_validator.c
@@ -146,12 +146,12 @@
 :: #endif
 :: if type(m) == OFDataMember and m.oftype.startswith('list') and m.offset is not None:
 :: # Validate fixed-offset lists
-:: if m.name in field_length_members:
-:: continue # TODO handle field length members
+:: if not m.name in field_length_members:
+    int wire_len_${m.name} = len - ${m.offset};
 :: #endif
 :: element_name = m.oftype[8:-3]
 :: list_validator_name = raw_validator_name('of_list_' + element_name, version)
-    if (${list_validator_name}(data + ${m.offset}, len - ${m.offset}, out_len) < 0) {
+    if (${list_validator_name}(data + ${m.offset}, wire_len_${m.name}, out_len) < 0) {
         return -1;
     }