diff --git a/MdePkg/Include/IndustryStandard/Tpm12.h b/MdePkg/Include/IndustryStandard/Tpm12.h
index 0e5a9019e86a..0435bebe8e18 100644
--- a/MdePkg/Include/IndustryStandard/Tpm12.h
+++ b/MdePkg/Include/IndustryStandard/Tpm12.h
@@ -9,14 +9,6 @@
 #ifndef _TPM12_H_
 #define _TPM12_H_
 
-///
-/// Temporary disable 4201 to support anonymous unions
-///
-#if defined (_MSC_EXTENSIONS)
-#pragma warning( push )
-#pragma warning ( disable : 4201 )
-#endif
-
 ///
 /// The start of TPM return codes
 ///
@@ -752,10 +744,7 @@ typedef struct tdTPM_PERMANENT_FLAGS {
   BOOLEAN              TPMpost;
   BOOLEAN              TPMpostLock;
   BOOLEAN              FIPS;
-  union {
-    BOOLEAN            operator;
-    BOOLEAN            operator_;
-  };
+  BOOLEAN              operator_;
   BOOLEAN              enableRevokeEK;
   BOOLEAN              nvLocked;
   BOOLEAN              readSRKPub;
@@ -2173,11 +2162,4 @@ typedef struct tdTPM_RSP_COMMAND_HDR {
 
 #pragma pack ()
 
-///
-/// Temporary disable 4201 to support anonymous unions
-///
-#if defined (_MSC_EXTENSIONS)
-#pragma warning( pop )
-#endif
-
 #endif
diff --git a/MdePkg/Include/IndustryStandard/Tpm20.h b/MdePkg/Include/IndustryStandard/Tpm20.h
index 52092bd6144f..609b727ac8ee 100644
--- a/MdePkg/Include/IndustryStandard/Tpm20.h
+++ b/MdePkg/Include/IndustryStandard/Tpm20.h
@@ -15,14 +15,6 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
 
 #include <IndustryStandard/Tpm12.h>
 
-///
-/// Temporary disable 4201 to support anonymous unions
-///
-#if defined (_MSC_EXTENSIONS)
-#pragma warning( push )
-#pragma warning ( disable : 4201 )
-#endif
-
 #pragma pack (1)
 
 // Annex A Algorithm Constants
@@ -1256,10 +1248,7 @@ typedef union {
   TPMI_AES_KEY_BITS    aes;
   TPMI_SM4_KEY_BITS    SM4;
   TPM_KEY_BITS         sym;
-  union {
-    TPMI_ALG_HASH      xor;
-    TPMI_ALG_HASH      xor_;
-  };
+  TPMI_ALG_HASH        xor_;
 } TPMU_SYM_KEY_BITS;
 
 // Table 123 - TPMU_SYM_MODE Union
@@ -1332,10 +1321,7 @@ typedef struct {
 // Table 136 - TPMU_SCHEME_KEYEDHASH Union
 typedef union {
   TPMS_SCHEME_HMAC    hmac;
-  union {
-    TPMS_SCHEME_XOR   xor;
-    TPMS_SCHEME_XOR   xor_;
-  };
+  TPMS_SCHEME_XOR     xor_;
 } TPMU_SCHEME_KEYEDHASH;
 
 // Table 137 - TPMT_KEYEDHASH_SCHEME Structure
@@ -1824,11 +1810,4 @@ typedef struct {
 #define HASH_ALG_SHA512   0x00000008
 #define HASH_ALG_SM3_256  0x00000010
 
-///
-/// Temporary disable 4201 to support anonymous unions
-///
-#if defined (_MSC_EXTENSIONS)
-#pragma warning( pop )
-#endif
-
 #endif