diff --git a/tools/firmware-utils/Makefile b/tools/firmware-utils/Makefile
index 7fa6f71e4a..ba4df640ce 100644
--- a/tools/firmware-utils/Makefile
+++ b/tools/firmware-utils/Makefile
@@ -81,7 +81,7 @@ define Host/Compile
 	$(call cc,mkbuffaloimg, -Wall)
 	$(call cc,zyimage, -Wall)
 	$(call cc,mkdhpimg buffalo-lib, -Wall)
-	$(call cc,mkdlinkfw mkdlinkfw-lib, -lz -Wall)
+	$(call cc,mkdlinkfw mkdlinkfw-lib, -lz -Wall --std=gnu99)
 endef
 
 define Host/Install