diff --git a/NetworkPkg/IScsiDxe/IScsiCHAP.c b/NetworkPkg/IScsiDxe/IScsiCHAP.c
index cbbc56ae5b..df3c2eb120 100644
--- a/NetworkPkg/IScsiDxe/IScsiCHAP.c
+++ b/NetworkPkg/IScsiDxe/IScsiCHAP.c
@@ -289,7 +289,7 @@ IScsiCHAPOnRspReceived (
     }
 
     AuthData->InIdentifier      = (UINT32) Result;
-    AuthData->InChallengeLength = ISCSI_CHAP_AUTH_MAX_LEN;
+    AuthData->InChallengeLength = (UINT32) sizeof (AuthData->InChallenge);
     IScsiHexToBin (
       (UINT8 *) AuthData->InChallenge,
       &AuthData->InChallengeLength,
diff --git a/NetworkPkg/IScsiDxe/IScsiCHAP.h b/NetworkPkg/IScsiDxe/IScsiCHAP.h
index 5e59fb678b..1fc1d96ea3 100644
--- a/NetworkPkg/IScsiDxe/IScsiCHAP.h
+++ b/NetworkPkg/IScsiDxe/IScsiCHAP.h
@@ -49,7 +49,7 @@ typedef struct _ISCSI_CHAP_AUTH_CONFIG_NVDATA {
 typedef struct _ISCSI_CHAP_AUTH_DATA {
   ISCSI_CHAP_AUTH_CONFIG_NVDATA *AuthConfig;
   UINT32                        InIdentifier;
-  UINT8                         InChallenge[ISCSI_CHAP_AUTH_MAX_LEN];
+  UINT8                         InChallenge[1024];
   UINT32                        InChallengeLength;
   //
   // Calculated CHAP Response (CHAP_R) value.