diff --git a/programs/develop/libraries/iconv/Tupfile.lua b/programs/develop/libraries/iconv/Tupfile.lua
index 2fc0b5246e..07d225446b 100644
--- a/programs/develop/libraries/iconv/Tupfile.lua
+++ b/programs/develop/libraries/iconv/Tupfile.lua
@@ -1,2 +1,2 @@
 if tup.getconfig("NO_GCC") ~= "" then return end
-tup.rule("iconv.c", "kos32-gcc -fno-ident -Os -c -o %o %f " .. tup.getconfig("KPACK_CMD"), "iconv.obj")
+tup.rule("iconv.c", "kos32-gcc -c -I../../include -fno-ident -Os -c -o %o %f " .. tup.getconfig("KPACK_CMD"), "iconv.obj")