diff --git a/src/utility/HCI.cpp b/src/utility/HCI.cpp
index aa877f6c..51366db3 100644
--- a/src/utility/HCI.cpp
+++ b/src/utility/HCI.cpp
@@ -427,7 +427,7 @@ int HCIClass::sendAclPkt(uint16_t handle, uint8_t cid, uint8_t plen, void* data)
     uint16_t cid;
   } aclHdr = { HCI_ACLDATA_PKT, handle, uint8_t(plen + 4), plen, cid };
 
-  uint8_t *txBuffer = uint8_t*malloc(sizeof(aclHdr) + plen);
+  uint8_t* txBuffer = (uint8_t*)malloc(sizeof(aclHdr) + plen);
   memcpy(txBuffer, &aclHdr, sizeof(aclHdr));
   memcpy(&txBuffer[sizeof(aclHdr)], data, plen);
 
@@ -470,7 +470,7 @@ int HCIClass::sendCommand(uint16_t opcode, uint8_t plen, void* parameters)
     uint8_t plen;
   } pktHdr = {HCI_COMMAND_PKT, opcode, plen};
 
-  uint8_t *txBuffer = uint8_t*malloc(sizeof(pktHdr) + plen);
+  uint8_t* txBuffer = (uint8_t*)malloc(sizeof(pktHdr) + plen);
   memcpy(txBuffer, &pktHdr, sizeof(pktHdr));
   memcpy(&txBuffer[sizeof(pktHdr)], parameters, plen);