diff -Naur busybox-1.25.1/coreutils/cp.c busybox-1.25.1-alx/coreutils/cp.c
--- busybox-1.25.1/coreutils/cp.c	2016-09-27 18:53:50.000000000 +0200
+++ busybox-1.25.1-alx/coreutils/cp.c	2016-10-27 14:14:31.875550139 +0200
@@ -63,7 +63,7 @@
 	// -r and -R are the same
 	// -R (and therefore -r) turns on -d (coreutils does this)
 	// -a = -pdR
-	opt_complementary = "-2:l--s:s--l:Pd:rRd:Rd:apdR";
+	opt_complementary = "-2:l--s:s--l:Pd:rRd:Rd:xapdR";
 #if ENABLE_FEATURE_CP_LONG_OPTIONS
 	applet_long_options =
 		"archive\0"        No_argument "a"
@@ -76,6 +76,7 @@
 		"symbolic-link\0"  No_argument "s"
 		"verbose\0"        No_argument "v"
 		"update\0"         No_argument "u"
+		"one-file-system\0" No_argument "x"
 		"remove-destination\0" No_argument "\xff"
 		"parents\0"        No_argument "\xfe"
 		;