diff --git a/build.lua b/build.lua
index d667228..d20a0b8 100644
--- a/build.lua
+++ b/build.lua
@@ -4,5 +4,5 @@ module = "luametalatex"
 
 tdsroot = "luametatex" -- Would be luametalatex but we use the same files for luametaplain
 
-installfiles = {"luametalatex*.lua", "luametaplain*.lua"}
-sourcefiles = {"*.lua"}
+installfiles = {"luametalatex*.lua", "luametaplain*.lua", "kpse.*"}
+sourcefiles = {"*.lua", "kpse.*"}