diff --git a/NetworkPkg/UefiPxeBcDxe/PxeBcDhcp6.c b/NetworkPkg/UefiPxeBcDxe/PxeBcDhcp6.c
index 23ec9e7fc9..92972f6706 100644
--- a/NetworkPkg/UefiPxeBcDxe/PxeBcDhcp6.c
+++ b/NetworkPkg/UefiPxeBcDxe/PxeBcDhcp6.c
@@ -339,7 +339,7 @@ PxeBcExtractBootFileUrl (
       if (*BootFileNamePtr == '%') {
         TmpChar = *(BootFileNamePtr+ 3);
         *(BootFileNamePtr+ 3) = '\0';
-        *BootFileName = (UINT8) AsciiStrHexToUintn (BootFileNamePtr + 1);
+        *BootFileName = (UINT8) AsciiStrHexToUintn ((CHAR8*)(BootFileNamePtr + 1));
         BootFileName++;
         *(BootFileNamePtr+ 3) = TmpChar;
         BootFileNamePtr += 3;