diff --git a/MdeModulePkg/Universal/Variable/EmuRuntimeDxe/EmuVariable.c b/MdeModulePkg/Universal/Variable/EmuRuntimeDxe/EmuVariable.c
index 6dee2b6add..8ad2c7168d 100644
--- a/MdeModulePkg/Universal/Variable/EmuRuntimeDxe/EmuVariable.c
+++ b/MdeModulePkg/Universal/Variable/EmuRuntimeDxe/EmuVariable.c
@@ -575,7 +575,7 @@ CHAR8 *
 EFIAPI
 VariableGetBestLanguage (
   IN CONST CHAR8  *SupportedLanguages, 
-  IN BOOLEAN      Iso639Language,
+  IN UINTN        Iso639Language,
   ...
   )
 {
diff --git a/MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.c b/MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.c
index d17361f805..5eff808035 100644
--- a/MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.c
+++ b/MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.c
@@ -1562,7 +1562,7 @@ CHAR8 *
 EFIAPI
 VariableGetBestLanguage (
   IN CONST CHAR8  *SupportedLanguages,
-  IN BOOLEAN      Iso639Language,
+  IN UINTN        Iso639Language,
   ...
   )
 {