diff --git a/EmbeddedPkg/Drivers/AndroidFastbootTransportTcpDxe/FastbootTransportTcp.c b/EmbeddedPkg/Drivers/AndroidFastbootTransportTcpDxe/FastbootTransportTcp.c
index 8f3e91cae4..a31ca16752 100644
--- a/EmbeddedPkg/Drivers/AndroidFastbootTransportTcpDxe/FastbootTransportTcp.c
+++ b/EmbeddedPkg/Drivers/AndroidFastbootTransportTcpDxe/FastbootTransportTcp.c
@@ -292,6 +292,7 @@ ConnectionAccepted (
   start waiting for a TCP connection on the Fastboot port.
 */
 EFI_STATUS
+EFIAPI
 TcpFastbootTransportStart (
   EFI_EVENT  ReceiveEvent
   )
@@ -466,6 +467,7 @@ TcpFastbootTransportStart (
 }
 
 EFI_STATUS
+EFIAPI
 TcpFastbootTransportStop (
   VOID
   )
@@ -558,6 +560,7 @@ DataSent (
 }
 
 EFI_STATUS
+EFIAPI
 TcpFastbootTransportSend (
   IN        UINTN      BufferSize,
   IN  CONST VOID       *Buffer,
@@ -603,6 +606,7 @@ TcpFastbootTransportSend (
 }
 
 EFI_STATUS
+EFIAPI
 TcpFastbootTransportReceive (
   OUT UINTN  *BufferSize,
   OUT VOID   **Buffer
diff --git a/EmbeddedPkg/Include/Protocol/AndroidFastbootTransport.h b/EmbeddedPkg/Include/Protocol/AndroidFastbootTransport.h
index b90d491d4a..75d8021252 100644
--- a/EmbeddedPkg/Include/Protocol/AndroidFastbootTransport.h
+++ b/EmbeddedPkg/Include/Protocol/AndroidFastbootTransport.h
@@ -42,7 +42,7 @@ extern EFI_GUID  gAndroidFastbootTransportProtocolGuid;
 */
 typedef
 EFI_STATUS
-(*FASTBOOT_TRANSPORT_START) (
+(EFIAPI *FASTBOOT_TRANSPORT_START)(
   IN EFI_EVENT  ReceiveEvent
   );
 
@@ -60,7 +60,7 @@ EFI_STATUS
 */
 typedef
 EFI_STATUS
-(*FASTBOOT_TRANSPORT_STOP) (
+(EFIAPI *FASTBOOT_TRANSPORT_STOP)(
   VOID
   );
 
@@ -85,7 +85,7 @@ EFI_STATUS
  */
 typedef
 EFI_STATUS
-(*FASTBOOT_TRANSPORT_SEND) (
+(EFIAPI *FASTBOOT_TRANSPORT_SEND)(
   IN        UINTN      BufferSize,
   IN  CONST VOID       *Buffer,
   IN        EFI_EVENT  *FatalErrorEvent
@@ -110,7 +110,7 @@ EFI_STATUS
 */
 typedef
 EFI_STATUS
-(*FASTBOOT_TRANSPORT_RECEIVE) (
+(EFIAPI *FASTBOOT_TRANSPORT_RECEIVE)(
   OUT UINTN  *BufferSize,
   OUT VOID   **Buffer
   );