diff --git a/build/top.mk b/build/top.mk
index 544215c49e..239f0a09d0 100644
--- a/build/top.mk
+++ b/build/top.mk
@@ -60,6 +60,7 @@ CHMOD = chmod
 DATE = date
 HOSTNAME = uname -n
 LN = ln
+LN_H = @LN_H@
 LN_S = @LN_S@
 MAKEINFO = @MAKEINFO@
 MKDIR = mkdir -p