diff --git a/MdeModulePkg/Universal/EbcDxe/EbcDebugger/EdbSupportString.c b/MdeModulePkg/Universal/EbcDxe/EbcDebugger/EdbSupportString.c
index 78a0559079..8495af9900 100644
--- a/MdeModulePkg/Universal/EbcDxe/EbcDebugger/EdbSupportString.c
+++ b/MdeModulePkg/Universal/EbcDxe/EbcDebugger/EdbSupportString.c
@@ -1,6 +1,6 @@
 /** @file
 
-Copyright (c) 2007 - 2016, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2007 - 2019, Intel Corporation. All rights reserved.<BR>
 This program and the accompanying materials
 are licensed and made available under the terms and conditions of the BSD License
 which accompanies this distribution.  The full text of the license may be found at
@@ -316,7 +316,7 @@ AsciiAtoi (
 **/
 STATIC
 CHAR16
-UnicodeToUpper (
+InternalUnicodeToUpper (
   IN      CHAR16                    Chr
   )
 {
@@ -332,7 +332,7 @@ UnicodeToUpper (
 **/
 STATIC
 CHAR8
-AsciiToUpper (
+InternalAsciiToUpper (
   IN      CHAR8                     Chr
   )
 {
@@ -390,12 +390,12 @@ StriCmp (
   )
 {
   while ((*String != L'\0') &&
-         (UnicodeToUpper (*String) == UnicodeToUpper (*String2))) {
+         (InternalUnicodeToUpper (*String) == InternalUnicodeToUpper (*String2))) {
     String++;
     String2++;
   }
 
-  return UnicodeToUpper (*String) - UnicodeToUpper (*String2);
+  return InternalUnicodeToUpper (*String) - InternalUnicodeToUpper (*String2);
 }
 
 /**
@@ -418,12 +418,12 @@ StriCmpUnicodeAndAscii (
   )
 {
   while ((*String != L'\0') &&
-         (UnicodeToUpper (*String) == (CHAR16)AsciiToUpper (*String2))) {
+         (InternalUnicodeToUpper (*String) == (CHAR16)InternalAsciiToUpper (*String2))) {
     String++;
     String2++;
   }
 
-  return UnicodeToUpper (*String) - (CHAR16)AsciiToUpper (*String2);
+  return InternalUnicodeToUpper (*String) - (CHAR16)InternalAsciiToUpper (*String2);
 }
 
 /**