diff --git a/MdePkg/Library/BaseLib/Ia32/DisableCache.asm b/MdePkg/Library/BaseLib/Ia32/DisableCache.asm
index 0d92472687..67247948b6 100644
--- a/MdePkg/Library/BaseLib/Ia32/DisableCache.asm
+++ b/MdePkg/Library/BaseLib/Ia32/DisableCache.asm
@@ -22,7 +22,7 @@
 ;
 ;------------------------------------------------------------------------------
 
-    .386p
+    .486p
     .model  flat,C
     .code
 
diff --git a/MdePkg/Library/BaseLib/Ia32/EnableCache.asm b/MdePkg/Library/BaseLib/Ia32/EnableCache.asm
index e25a5bf44d..c47ee1c60b 100644
--- a/MdePkg/Library/BaseLib/Ia32/EnableCache.asm
+++ b/MdePkg/Library/BaseLib/Ia32/EnableCache.asm
@@ -22,7 +22,7 @@
 ;
 ;------------------------------------------------------------------------------
 
-    .386p
+    .486p
     .model  flat,C
     .code