diff --git a/include/keyboard_layout.h b/include/keyboard_layout.h
index e521d171c..a097e629a 100644
--- a/include/keyboard_layout.h
+++ b/include/keyboard_layout.h
@@ -7,7 +7,7 @@
 #define _KEYBOARD_LAYOUT_H
 
 bool initialize_keyboard_layout_mapping (const char *filename, keyboard_layout_mapping_t *keyboard_layout_mapping, int *keyboard_layout_mapping_cnt);
-int  find_keyboard_layout_map (const u32 search, const int search_len, keyboard_layout_mapping_t *s_keyboard_layout_mapping, const int keyboard_layout_mapping_cnt);
-int  execute_keyboard_layout_mapping (u32 plain_buf[64], const int plain_len, keyboard_layout_mapping_t *s_keyboard_layout_mapping, const int keyboard_layout_mapping_cnt);
+int  find_keyboard_layout_map (const u32 search, const int search_len, const keyboard_layout_mapping_t *s_keyboard_layout_mapping, const int keyboard_layout_mapping_cnt);
+int  execute_keyboard_layout_mapping (u32 plain_buf[64], const int plain_len, const keyboard_layout_mapping_t *s_keyboard_layout_mapping, const int keyboard_layout_mapping_cnt);
 
 #endif // _KEYBOARD_LAYOUT_H
diff --git a/src/keyboard_layout.c b/src/keyboard_layout.c
index 3c5efba93..24778e1ba 100644
--- a/src/keyboard_layout.c
+++ b/src/keyboard_layout.c
@@ -90,7 +90,7 @@ bool initialize_keyboard_layout_mapping (const char *filename, keyboard_layout_m
   return true;
 }
 
-int find_keyboard_layout_map (const u32 search, const int search_len, keyboard_layout_mapping_t *s_keyboard_layout_mapping, const int keyboard_layout_mapping_cnt)
+int find_keyboard_layout_map (const u32 search, const int search_len, const keyboard_layout_mapping_t *s_keyboard_layout_mapping, const int keyboard_layout_mapping_cnt)
 {
   for (int idx = 0; idx < keyboard_layout_mapping_cnt; idx++)
   {
@@ -108,7 +108,7 @@ int find_keyboard_layout_map (const u32 search, const int search_len, keyboard_l
   return -1;
 }
 
-int execute_keyboard_layout_mapping (u32 plain_buf[64], const int plain_len, keyboard_layout_mapping_t *s_keyboard_layout_mapping, const int keyboard_layout_mapping_cnt)
+int execute_keyboard_layout_mapping (u32 plain_buf[64], const int plain_len, const keyboard_layout_mapping_t *s_keyboard_layout_mapping, const int keyboard_layout_mapping_cnt)
 {
   u32 out_buf[16] = { 0 };