diff --git a/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigFileExplorer.c b/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigFileExplorer.c
index 05d97dc43b..1b6f888042 100644
--- a/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigFileExplorer.c
+++ b/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigFileExplorer.c
@@ -343,6 +343,7 @@ UpdatePage(
   @retval FALSE  Not exit caller function.
 **/
 BOOLEAN
+EFIAPI
 UpdatePKFromFile (
   IN EFI_DEVICE_PATH_PROTOCOL    *FilePath
   )
@@ -360,6 +361,7 @@ UpdatePKFromFile (
   @retval FALSE  Not exit caller function.
 **/
 BOOLEAN
+EFIAPI
 UpdateKEKFromFile (
   IN EFI_DEVICE_PATH_PROTOCOL    *FilePath
   )
@@ -376,6 +378,7 @@ UpdateKEKFromFile (
   @retval FALSE  Not exit caller function.
 **/
 BOOLEAN
+EFIAPI
 UpdateDBFromFile (
   IN EFI_DEVICE_PATH_PROTOCOL    *FilePath
   )
@@ -392,6 +395,7 @@ UpdateDBFromFile (
   @retval FALSE  Not exit caller function.
 **/
 BOOLEAN
+EFIAPI
 UpdateDBXFromFile (
   IN EFI_DEVICE_PATH_PROTOCOL    *FilePath
   )
@@ -408,6 +412,7 @@ UpdateDBXFromFile (
   @retval FALSE  Not exit caller function.
 **/
 BOOLEAN
+EFIAPI
 UpdateDBTFromFile (
   IN EFI_DEVICE_PATH_PROTOCOL    *FilePath
   )
diff --git a/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigImpl.h b/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigImpl.h
index a8dbd92ee4..1ee9580140 100644
--- a/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigImpl.h
+++ b/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigImpl.h
@@ -561,6 +561,7 @@ GuidToString (
   @retval FALSE  Not exit caller function.
 **/
 BOOLEAN
+EFIAPI
 UpdatePKFromFile (
   IN EFI_DEVICE_PATH_PROTOCOL    *FilePath
   );
@@ -574,6 +575,7 @@ UpdatePKFromFile (
   @retval FALSE  Not exit caller function.
 **/
 BOOLEAN
+EFIAPI
 UpdateKEKFromFile (
   IN EFI_DEVICE_PATH_PROTOCOL    *FilePath
   );
@@ -587,6 +589,7 @@ UpdateKEKFromFile (
   @retval FALSE  Not exit caller function.
 **/
 BOOLEAN
+EFIAPI
 UpdateDBFromFile (
   IN EFI_DEVICE_PATH_PROTOCOL    *FilePath
   );
@@ -600,6 +603,7 @@ UpdateDBFromFile (
   @retval FALSE  Not exit caller function.
 **/
 BOOLEAN
+EFIAPI
 UpdateDBXFromFile (
   IN EFI_DEVICE_PATH_PROTOCOL    *FilePath
   );
@@ -613,6 +617,7 @@ UpdateDBXFromFile (
   @retval FALSE  Not exit caller function.
 **/
 BOOLEAN
+EFIAPI
 UpdateDBTFromFile (
   IN EFI_DEVICE_PATH_PROTOCOL    *FilePath
   );