diff --git a/easyflash/inc/ef_cfg.h b/easyflash/inc/ef_cfg.h
index 9c7630d..52d3e11 100644
--- a/easyflash/inc/ef_cfg.h
+++ b/easyflash/inc/ef_cfg.h
@@ -41,7 +41,7 @@
  */
 #define EF_ENV_VER_NUM            /* @note you must define it for a value, such as 0 */
 
-#define LITTLE_ENDIAN             1     /* @note you must define it reference to MCU Order*/
+#define EF_LITTLE_ENDIAN             1     /* @note you must define it reference to MCU Order*/
 
 #endif /* EF_USING_ENV */
 
diff --git a/easyflash/src/ef_env.c b/easyflash/src/ef_env.c
index 5af90b2..6777244 100644
--- a/easyflash/src/ef_env.c
+++ b/easyflash/src/ef_env.c
@@ -495,7 +495,7 @@ static uint32_t find_next_env_addr(uint32_t start, uint32_t end)
     for (; start < end; start += (sizeof(buf) - sizeof(uint32_t))) {
         ef_port_read(start, (uint32_t *) buf, sizeof(buf));
         for (i = 0; i < sizeof(buf) - sizeof(uint32_t) && start + i < end; i++) {
-#if LITTLE_ENDIAN            // Little Endian Order
+#if EF_LITTLE_ENDIAN            // Little Endian Order
             magic = buf[i] + (buf[i + 1] << 8) + (buf[i + 2] << 16) + (buf[i + 3] << 24);
 #else                       // Big Endian Order
             magic = buf[i + 3] + (buf[i + 2] << 8) + (buf[i + 1] << 16) + (buf[i] << 24);