diff --git a/lips/Preproc.lua b/lips/Preproc.lua
index f10fb38..89116e8 100644
--- a/lips/Preproc.lua
+++ b/lips/Preproc.lua
@@ -79,7 +79,7 @@ function Preproc:process(tokens)
             if label:sub(1, 1) == '+' then
                 insert(plus_labels, rl)
             elseif label:sub(1, 1) == '-' then
-                insert(minus_labels, rl)
+                insert(minus_labels, 1, rl)
             else
                 error('Internal Error: unexpected token for relative label')
             end