diff --git a/core/Makefile b/core/Makefile
index 2a0c831..a49850e 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -234,6 +234,8 @@
 	         private_key=""' >> $@;,\
 	    echo 'name="$(p).apk" certificate="$(PACKAGES.$(p).CERTIFICATE)" \
 	         private_key="$(PACKAGES.$(p).PRIVATE_KEY)"' >> $@;))
+	# In case $(PACKAGES) is empty.
+	$(hide) touch $@
 
 .PHONY: apkcerts-list
 apkcerts-list: $(APKCERTS_FILE)