diff --git a/MdePkg/Library/BaseLib/Ia32/CpuBreakpoint.c b/MdePkg/Library/BaseLib/Ia32/CpuBreakpoint.c
index f5df7f2883..4f8c92df76 100644
--- a/MdePkg/Library/BaseLib/Ia32/CpuBreakpoint.c
+++ b/MdePkg/Library/BaseLib/Ia32/CpuBreakpoint.c
@@ -19,7 +19,7 @@
   Microsoft Visual Studio 7.1 Function Prototypes for I/O Intrinsics.
 **/
 
-void __debugbreak ();
+void __debugbreak (VOID);
 
 #pragma intrinsic(__debugbreak)
 
diff --git a/MdePkg/Library/BaseLib/X64/CpuBreakpoint.c b/MdePkg/Library/BaseLib/X64/CpuBreakpoint.c
index d654f84571..7d0cf4c412 100644
--- a/MdePkg/Library/BaseLib/X64/CpuBreakpoint.c
+++ b/MdePkg/Library/BaseLib/X64/CpuBreakpoint.c
@@ -17,7 +17,7 @@
   Microsoft Visual Studio 7.1 Function Prototypes for I/O Intrinsics.
 **/
 
-void __debugbreak ();
+void __debugbreak (VOID);
 
 #pragma intrinsic(__debugbreak)
 
diff --git a/MdePkg/Library/DxeExtractGuidedSectionLib/DxeExtractGuidedSectionLib.c b/MdePkg/Library/DxeExtractGuidedSectionLib/DxeExtractGuidedSectionLib.c
index 8b8e52829b..744201bb49 100644
--- a/MdePkg/Library/DxeExtractGuidedSectionLib/DxeExtractGuidedSectionLib.c
+++ b/MdePkg/Library/DxeExtractGuidedSectionLib/DxeExtractGuidedSectionLib.c
@@ -38,6 +38,7 @@ EXTRACT_GUIDED_SECTION_GET_INFO_HANDLER *mExtractGetInfoHandlerTable = NULL;
 RETURN_STATUS
 EFIAPI
 ReallocateExtractHandlerTable (
+  VOID
   )
 { 
   //