diff --git a/src/core/client_config/subchannel_index.c b/src/core/client_config/subchannel_index.c
index 3f948998f9cae1f4f4d81ae46c2ce51ffdedcc7b..24cc76cf225ce0590a9624d4225b410211a98952 100644
--- a/src/core/client_config/subchannel_index.c
+++ b/src/core/client_config/subchannel_index.c
@@ -108,6 +108,7 @@ static int subchannel_key_compare(grpc_subchannel_key *a,
   if (c != 0) return c;
   c = memcmp(a->args.filters, b->args.filters,
              a->args.filter_count * sizeof(*a->args.filters));
+  if (c != 0) return c;
   return grpc_channel_args_compare(a->args.args, b->args.args);
 }