diff --git a/cross/Makefile.in b/cross/Makefile.in
index b8955a70ebd..3cde1d6d2da 100644
--- a/cross/Makefile.in
+++ b/cross/Makefile.in
@@ -20,6 +20,7 @@
 top_srcdir = @top_srcdir@
 srcdir = @srcdir@
 top_builddir = @top_builddir@
+builddir = @builddir@
 
 -include $(top_builddir)/src/verbose.mk