diff --git a/OptionRomPkg/CirrusLogic5430Dxe/Edid.c b/OptionRomPkg/CirrusLogic5430Dxe/Edid.c
index 73999e3f15..fcbfc02410 100644
--- a/OptionRomPkg/CirrusLogic5430Dxe/Edid.c
+++ b/OptionRomPkg/CirrusLogic5430Dxe/Edid.c
@@ -118,7 +118,7 @@ ReadEdidData (
   UINT64            Signature;
 
   for (Index = 0; Index < EDID_BLOCK_SIZE * 2; Index ++) {
-    I2cReadByte (Private->PciIo, 0xa0, Index, &EdidData[Index]);
+    I2cReadByte (Private->PciIo, 0xa0, (UINT8)Index, &EdidData[Index]);
   }
 
   //