diff --git a/luci.mk b/luci.mk
index 0b3a66e3b5..d7a89d9ff1 100644
--- a/luci.mk
+++ b/luci.mk
@@ -64,7 +64,7 @@ PKG_NAME?=$(LUCI_NAME)
 define findrev
   $(shell \
     if git log -1 >/dev/null 2>/dev/null; then \
-      set -- $$(git log -1 --format="%ct %h" --abbrev=7 -- '$(if $(1),:(exclude))po'); \
+      set -- $$(git log -1 --format="%ct %h" --abbrev=7 -- $(if $(1),. ':(exclude)po',po)); \
       if [ -n "$$1" ]; then
         secs="$$(($$1 % 86400))"; \
         yday="$$(date --utc --date="@$$1" "+%y.%j")"; \