diff --git a/programs/system/shell/Tupfile.lua b/programs/system/shell/Tupfile.lua
index a35da612e8..7d99b9e106 100644
--- a/programs/system/shell/Tupfile.lua
+++ b/programs/system/shell/Tupfile.lua
@@ -19,4 +19,4 @@ end
 LIBS = "-ltcc -lc.obj"
 COMMAND=string.format("%s %s %s %s %s", TCC, CFLAGS, LDFLAGS , "%f -o %o",  LIBS)
 
-tup.rule({"shell.c", "system/kolibri.c"}, COMMAND .. tup.getconfig("KPACK_CMD"), "shell")
\ No newline at end of file
+tup.rule({"shell.c", "system/kolibri.c"}, extra_inputs = {"lang.h"}, COMMAND .. tup.getconfig("KPACK_CMD"), "shell")
\ No newline at end of file