diff --git a/easyflash/port/ef_port.c b/easyflash/port/ef_port.c
index 064bec3..266e418 100644
--- a/easyflash/port/ef_port.c
+++ b/easyflash/port/ef_port.c
@@ -27,9 +27,10 @@
  */
 
 #include <easyflash.h>
+#include <stdarg.h>
 
 /* default environment variables set for user */
-static const flash_env default_env_set[] = {
+static const ef_env default_env_set[] = {
 
 };