diff --git a/src/lv_misc/lv_utils.h b/src/lv_misc/lv_utils.h
index 33e462b39..17c221344 100644
--- a/src/lv_misc/lv_utils.h
+++ b/src/lv_misc/lv_utils.h
@@ -38,12 +38,18 @@ char * lv_utils_num_to_str(int32_t num, char * buf);
 /**
  * Convert a fixed point number to string
  * @param num a number
- * @param number of digits after decimal point
+ * @param decimals number of digits after decimal point
  * @param buf pointer to a `char` buffer. Buffer must be big enough for number.
  * @return same as `buf` (just for convenience)
  */
-char * lv_utils_num_to_str_fixed(int32_t num, int decimals, char * buf);
-    
+char * lv_utils_num_to_str_fixed(int32_t num, int32_t decimals, char * buf, size_t bufsize);
+
+/**
+ * Set the decimal separator character used by lv_utils_num_to_str_fixed
+ * @param separator the decimal separator char
+ */
+void lv_utils_set_decimal_separator(char separator);
+
 /** Searches base[0] to base[n - 1] for an item that matches *key.
  *
  * @note The function cmp must return negative if its first