diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index bdf42fd..8f93d8d 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -244,7 +244,8 @@
 # ---------------------------------------------------------------------------
 
 quiet_cmd_gzip = GZIP    $@
-      cmd_gzip = cat $(real-prereqs) | $(KGZIP) -n -f -9 > $@
+      cmd_gzip = cat $(real-prereqs) | $(KGZIP) -n -f -9 > $@ && \
+		( which advdef > /dev/null && advdef -z4 $@ ; true )
 
 # DTC
 # ---------------------------------------------------------------------------