diff --git a/inputd/build.sh b/inputd/build.sh
index d2e5891..e2fb71d 100755
--- a/inputd/build.sh
+++ b/inputd/build.sh
@@ -1,3 +1,4 @@
 #!/bin/sh
 
+php map-to-c.php factory-keymap.txt > kmap.h
 gcc -o ppkbd main.c || exit 1
diff --git a/inputd/map-to-c.php b/inputd/map-to-c.php
index 2455de5..7d4eb3a 100644
--- a/inputd/map-to-c.php
+++ b/inputd/map-to-c.php
@@ -21,7 +21,7 @@
  */
 
 $pmap = file_get_contents("physical-map.txt");
-$kmap = file_get_contents("factory-keymap.txt");
+$kmap = file_get_contents($argv[1]);
 
 // high nibble = row, low nibble col
 $el_phys_map = [];