diff --git a/MdeModulePkg/Include/Library/PlatformVarCleanupLib.h b/MdeModulePkg/Include/Library/PlatformVarCleanupLib.h
index a4691f0e65..1d642f62ba 100644
--- a/MdeModulePkg/Include/Library/PlatformVarCleanupLib.h
+++ b/MdeModulePkg/Include/Library/PlatformVarCleanupLib.h
@@ -32,6 +32,7 @@ typedef enum {
 VAR_ERROR_FLAG
 EFIAPI
 GetLastBootVarErrorFlag (
+  VOID
   );
 
 /**
diff --git a/MdeModulePkg/Library/BrotliCustomDecompressLib/GuidedSectionExtraction.c b/MdeModulePkg/Library/BrotliCustomDecompressLib/GuidedSectionExtraction.c
index 427adb876a..c623e1e4f7 100644
--- a/MdeModulePkg/Library/BrotliCustomDecompressLib/GuidedSectionExtraction.c
+++ b/MdeModulePkg/Library/BrotliCustomDecompressLib/GuidedSectionExtraction.c
@@ -186,6 +186,7 @@ BrotliGuidedSectionExtraction (
 EFI_STATUS
 EFIAPI
 BrotliDecompressLibConstructor (
+  VOID
   )
 {
   return ExtractGuidedSectionRegisterHandlers (
diff --git a/MdeModulePkg/Library/DxeSecurityManagementLib/DxeSecurityManagementLib.c b/MdeModulePkg/Library/DxeSecurityManagementLib/DxeSecurityManagementLib.c
index b96d78664d..aa4d93b6f3 100644
--- a/MdeModulePkg/Library/DxeSecurityManagementLib/DxeSecurityManagementLib.c
+++ b/MdeModulePkg/Library/DxeSecurityManagementLib/DxeSecurityManagementLib.c
@@ -61,6 +61,7 @@ SECURITY2_INFO *mSecurity2Table      = NULL;
 RETURN_STATUS
 EFIAPI
 ReallocateSecurityHandlerTable (
+  VOID
   )
 {
   //
@@ -301,6 +302,7 @@ ExecuteSecurityHandlers (
 RETURN_STATUS
 EFIAPI
 ReallocateSecurity2HandlerTable (
+  VOID
   )
 {
   //
diff --git a/MdeModulePkg/Library/LzmaCustomDecompressLib/F86GuidedSectionExtraction.c b/MdeModulePkg/Library/LzmaCustomDecompressLib/F86GuidedSectionExtraction.c
index ada9a809fa..b02dc515f8 100644
--- a/MdeModulePkg/Library/LzmaCustomDecompressLib/F86GuidedSectionExtraction.c
+++ b/MdeModulePkg/Library/LzmaCustomDecompressLib/F86GuidedSectionExtraction.c
@@ -207,6 +207,7 @@ LzmaArchGuidedSectionExtraction (
 EFI_STATUS
 EFIAPI
 LzmaArchDecompressLibConstructor (
+  VOID
   )
 {
   return ExtractGuidedSectionRegisterHandlers (
diff --git a/MdeModulePkg/Library/LzmaCustomDecompressLib/GuidedSectionExtraction.c b/MdeModulePkg/Library/LzmaCustomDecompressLib/GuidedSectionExtraction.c
index f19e0d28cd..7ef9fbbfc6 100644
--- a/MdeModulePkg/Library/LzmaCustomDecompressLib/GuidedSectionExtraction.c
+++ b/MdeModulePkg/Library/LzmaCustomDecompressLib/GuidedSectionExtraction.c
@@ -190,6 +190,7 @@ LzmaGuidedSectionExtraction (
 EFI_STATUS
 EFIAPI
 LzmaDecompressLibConstructor (
+  VOID
   )
 {
   return ExtractGuidedSectionRegisterHandlers (
diff --git a/MdeModulePkg/Library/PlatformVarCleanupLib/PlatVarCleanupLib.c b/MdeModulePkg/Library/PlatformVarCleanupLib/PlatVarCleanupLib.c
index c5fd30e219..450b4b3443 100644
--- a/MdeModulePkg/Library/PlatformVarCleanupLib/PlatVarCleanupLib.c
+++ b/MdeModulePkg/Library/PlatformVarCleanupLib/PlatVarCleanupLib.c
@@ -1187,6 +1187,7 @@ Done:
 VAR_ERROR_FLAG
 EFIAPI
 GetLastBootVarErrorFlag (
+  VOID
   )
 {
   return mLastVarErrorFlag;
diff --git a/MdeModulePkg/Universal/SetupBrowserDxe/Expression.c b/MdeModulePkg/Universal/SetupBrowserDxe/Expression.c
index 901b35c720..297741c0fe 100644
--- a/MdeModulePkg/Universal/SetupBrowserDxe/Expression.c
+++ b/MdeModulePkg/Universal/SetupBrowserDxe/Expression.c
@@ -751,6 +751,7 @@ PopExpression (
 **/
 UINTN
 SaveExpressionEvaluationStackOffset (
+  VOID
   )
 {
   UINTN TempStackOffset;