diff --git a/SecurityPkg/Library/Tpm2CommandLib/Tpm2Session.c b/SecurityPkg/Library/Tpm2CommandLib/Tpm2Session.c
index 2cbc6272d0..f03b6689ac 100644
--- a/SecurityPkg/Library/Tpm2CommandLib/Tpm2Session.c
+++ b/SecurityPkg/Library/Tpm2CommandLib/Tpm2Session.c
@@ -99,7 +99,7 @@ Tpm2StartAuthSession (
   Buffer += Salt->size;
 
   *(TPM_SE *)Buffer = SessionType;
-  Buffer += sizeof(UINT8);
+  Buffer++;
 
   WriteUnaligned16 ((UINT16 *)Buffer, SwapBytes16 (Symmetric->algorithm));
   Buffer += sizeof(UINT16);