diff --git a/tools/Config.mk b/tools/Config.mk
index 0e2aac9cab..aa4dd29c36 100644
--- a/tools/Config.mk
+++ b/tools/Config.mk
@@ -463,7 +463,7 @@ define CATFILE
 endef
 else
 define CATFILE
-	$(Q) cat $(2) > $1
+	$(Q) if [ -z "$(strip $(2))" ]; then echo '' > $(1); else cat $(2) > $1; fi
 endef
 endif