diff --git a/backend/xerox_mfp.c b/backend/xerox_mfp.c
index 1151a4055..55f8acbda 100644
--- a/backend/xerox_mfp.c
+++ b/backend/xerox_mfp.c
@@ -503,7 +503,7 @@ static SANE_String_Const doc_sources[] = {
 };
 
 static int doc_source_to_code[] = {
-    0x40, 0x20, 0x80
+    DOC_FLATBED, DOC_ADF, DOC_AUTO
 };
 
 static SANE_String_Const scan_modes[] = {