diff --git a/include/btstack/utils.h b/include/btstack/utils.h
index 7d1bcf082..9e41248bc 100644
--- a/include/btstack/utils.h
+++ b/include/btstack/utils.h
@@ -108,7 +108,8 @@ void hexdump(void *data, int size);
 void printUUID(uint8_t *uuid);
 char * bd_addr_to_str(bd_addr_t addr);
 int sscan_bd_addr(uint8_t * addr_string, bd_addr_t addr);
-
+char * bd_addr_to_str(bd_addr_t addr);
+    
 uint8_t crc8_check(uint8_t *data, uint16_t len, uint8_t check_sum);
 uint8_t crc8_calc(uint8_t *data, uint16_t len);