diff --git a/openwrt/target/linux/image/ar7/Makefile b/openwrt/target/linux/image/ar7/Makefile
index 8bcd1bd54b..f5ad6cc660 100644
--- a/openwrt/target/linux/image/ar7/Makefile
+++ b/openwrt/target/linux/image/ar7/Makefile
@@ -78,6 +78,7 @@ $(eval $(call pattern_template,AG1B))
 $(eval $(call pattern_template,WA22))
 $(eval $(call pattern_template,WAG2))
 $(eval $(call pattern_template,WA21))
+$(eval $(call pattern_template,WA31,-b))
 $(eval $(call pattern_template,WA32,-b))
 
 ifeq ($(IB),)