diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/Mm.c b/ShellPkg/Library/UefiShellDebug1CommandsLib/Mm.c
index 9f97f1d345..d1fd42b1cd 100644
--- a/ShellPkg/Library/UefiShellDebug1CommandsLib/Mm.c
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/Mm.c
@@ -525,12 +525,6 @@ ShellCommandRunMm (
       goto Done;
     }
 
-    if ((AccessType == ShellMmIo) && (Address + Size > MAX_UINT16 + 1)) {
-      ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_MM_IO_ADDRESS_RANGE), gShellDebug1HiiHandle, L"mm");
-      ShellStatus = SHELL_INVALID_PARAMETER;
-      goto Done;
-    }
-
     //
     // locate IO protocol interface
     //
@@ -592,11 +586,6 @@ ShellCommandRunMm (
     //
     Complete = FALSE;
     do {
-      if ((AccessType == ShellMmIo) && (Address + Size > MAX_UINT16 + 1)) {
-        ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_MM_ADDRESS_RANGE2), gShellDebug1HiiHandle, L"mm");
-        break;
-      }
-
       ShellMmAccess (AccessType, PciRootBridgeIo, CpuIo, TRUE, Address, Size, &Buffer);
       ShellPrintHiiEx (-1, -1, NULL, mShellMmAccessTypeStr[AccessType], gShellDebug1HiiHandle);
       ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_MM_ADDRESS), gShellDebug1HiiHandle, Address);
diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/UefiShellDebug1CommandsLib.uni b/ShellPkg/Library/UefiShellDebug1CommandsLib/UefiShellDebug1CommandsLib.uni
index b6a133a454..011a7bfc2d 100644
--- a/ShellPkg/Library/UefiShellDebug1CommandsLib/UefiShellDebug1CommandsLib.uni
+++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/UefiShellDebug1CommandsLib.uni
@@ -128,7 +128,6 @@
 
 #string STR_MM_NOT_ALIGNED        #language en-US "%H%s%N: Address parameter %016LX is not aligned.\r\n"
 #string STR_MM_PCIE_ADDRESS_RANGE #language en-US "%H%s%N: Address parameter %016LX is not a valid PCI/PCIE address.\r\n"
-#string STR_MM_IO_ADDRESS_RANGE   #language en-US "%H%s%N: IO address out of range 0 - 0xFFFF\r\n"
 #string STR_MM_MMIO               #language en-US "%HMMIO%N"
 #string STR_MM_IO                 #language en-US "%HIO%N"
 #string STR_MM_PCI                #language en-US "%HPCI%N"
@@ -136,7 +135,6 @@
 #string STR_MM_PCIE               #language en-US "%HPCIE%N"
 #string STR_MM_ADDRESS            #language en-US "  0x%016lx : "
 #string STR_MM_BUF                #language en-US "0x%0*lx"
-#string STR_MM_ADDRESS_RANGE2     #language en-US "%H%s%N: IO address out of range\r\n"
 #string STR_MM_ERROR              #language en-US "%H%s%N: Input had incorrect format\r\n"
 
 #string STR_SETVAR_PRINT          #language en-US "%g - %s - %04x Bytes\r\n"