diff --git a/src/cpu/Makefile.inc b/src/cpu/Makefile.inc
index d9390610c6..52b58f7ecb 100644
--- a/src/cpu/Makefile.inc
+++ b/src/cpu/Makefile.inc
@@ -40,7 +40,7 @@ endif
 $(obj)/cpu_microcode_blob.bin: $$(cpu_microcode_bins)
 	@printf "    MICROCODE  $(subst $(obj)/,,$(@))\n"
 	@echo $(cpu_microcode_bins)
-	cat $+ > $@
+	cat /dev/null $+ > $@
 
 cbfs-files-$(cbfs_include_ucode) += cpu_microcode_blob.bin
 cpu_microcode_blob.bin-file := $(cpu_ucode_cbfs_file)