diff --git a/nomsu_compiler.lua b/nomsu_compiler.lua
index ca4b760..103a31e 100644
--- a/nomsu_compiler.lua
+++ b/nomsu_compiler.lua
@@ -493,6 +493,7 @@ do
         end
       end
       map_sources(lua)
+      map[lua_line] = map[lua_line] or nomsu_line
       map[0] = 0
       SOURCE_MAP[source_key] = map
     end
diff --git a/nomsu_compiler.moon b/nomsu_compiler.moon
index 080e3d7..747ddc6 100644
--- a/nomsu_compiler.moon
+++ b/nomsu_compiler.moon
@@ -323,7 +323,7 @@ with NomsuCompiler
                         nomsu_line = files.get_line_number(file, s.source.start)
                     for b in *s.bits do map_sources(b)
             map_sources(lua)
-            --map[lua_line] or= nomsu_line
+            map[lua_line] or= nomsu_line
             map[0] = 0
             -- Mapping from lua line number to nomsu line numbers
             SOURCE_MAP[source_key] = map