diff --git a/firmware/test/fat/autoconf.h b/firmware/test/fat/autoconf.h
new file mode 100644
index 0000000000..e5a91790af
--- /dev/null
+++ b/firmware/test/fat/autoconf.h
@@ -0,0 +1,9 @@
+/* fake autoconf for fat testing */
+
+#ifndef __BUILD_AUTOCONF_H
+#define __BUILD_AUTOCONF_H
+
+/* assume little endian for now */
+#define ROCKBOX_LITTLE_ENDIAN 1
+
+#endif