diff --git a/src/hci.c b/src/hci.c
index b607d5aca..df77ce368 100644
--- a/src/hci.c
+++ b/src/hci.c
@@ -73,10 +73,10 @@ void bt_flip_addr(bd_addr_t dest, bd_addr_t src){
     dest[5] = src[0];
 }
 
-void hexdump(uint8_t *data, int size){
+void hexdump(void *data, int size){
     int i;
     for (i=0; i<size;i++){
-        printf("%02X ", data[i]);
+        printf("%02X ", ((uint8_t *)data)[i]);
     }
     printf("\n");
 }
diff --git a/src/hci.h b/src/hci.h
index 1951b0404..c3533dab9 100644
--- a/src/hci.h
+++ b/src/hci.h
@@ -163,7 +163,7 @@ int hci_power_control(HCI_POWER_MODE mode);
 uint32_t hci_run();
 
 //
-void hexdump(uint8_t *data, int size);
+void hexdump(void *data, int size);
 
 // create and send hci command packet based on a template and a list of parameters
 int hci_send_cmd(hci_cmd_t *cmd, ...);