diff --git a/arch/powerpc/boot/flatdevtree.c b/arch/powerpc/boot/flatdevtree.c
index f2a29ca..e319a65 100644
--- a/arch/powerpc/boot/flatdevtree.c
+++ b/arch/powerpc/boot/flatdevtree.c
@@ -429,7 +429,7 @@
 {
 	int off, len;
 
-	off = lookup_string(cxt, name);
+	off = map_string(cxt, name);
 	if (off == NO_STRING)
 		return -1;