diff --git a/open_esplibs/libmain/user_interface.c b/open_esplibs/libmain/user_interface.c
index 1533594..9d6865b 100644
--- a/open_esplibs/libmain/user_interface.c
+++ b/open_esplibs/libmain/user_interface.c
@@ -110,7 +110,7 @@ bool IRAM sdk_system_rtc_mem_write(uint32_t des_addr, void *src_addr, uint16_t s
 }
 
 bool IRAM sdk_system_rtc_mem_read(uint32_t src_addr, void *des_addr, uint16_t save_size) {
-    uint32_t volatile *src_buf = (uint32_t *)src_addr;
+    uint32_t *dest_buf = (uint32_t *)des_addr;
 
     if (src_addr > 191) {
         return false;
@@ -125,7 +125,7 @@ bool IRAM sdk_system_rtc_mem_read(uint32_t src_addr, void *des_addr, uint16_t sa
         save_size = (save_size & ~3) + 4;
     }
     for (uint8_t i = 0; i < (save_size >> 2); i++) {
-        src_buf[i] = RTCMEM_SYSTEM[i];
+        dest_buf[i] = RTCMEM_SYSTEM[i];
     }
     return true;
 }