diff --git a/Visual Studio Projects/VAX.vcproj b/Visual Studio Projects/VAX.vcproj
index 13136d28..3aaebaa1 100644
--- a/Visual Studio Projects/VAX.vcproj	
+++ b/Visual Studio Projects/VAX.vcproj	
@@ -134,11 +134,13 @@
 				EnableIntrinsicFunctions="true"
 				FavorSizeOrSpeed="1"
 				OmitFramePointers="true"
+				WholeProgramOptimization="true"
 				AdditionalIncludeDirectories="./;../;../VAX/;../pdp11/;"../../windows-build/winpcap/Wpdpack/Include";"../../windows-build/pthreads""
 				PreprocessorDefinitions="USE_INT64;USE_ADDR64;VM_VAX;USE_SHARED;_CRT_NONSTDC_NO_WARNINGS;_CRT_SECURE_NO_WARNINGS;PTW32_STATIC_LIB;USE_READER_THREAD;SIM_ASYNCH_IO"
 				KeepComments="false"
 				StringPooling="true"
 				RuntimeLibrary="0"
+				BufferSecurityCheck="false"
 				EnableFunctionLevelLinking="true"
 				UsePrecompiledHeader="0"
 				WarningLevel="3"
@@ -166,6 +168,7 @@
 				SubSystem="1"
 				OptimizeReferences="2"
 				EnableCOMDATFolding="2"
+				LinkTimeCodeGeneration="1"
 				RandomizedBaseAddress="1"
 				DataExecutionPrevention="0"
 				TargetMachine="1"
@@ -260,6 +263,7 @@
 					>
 					<Tool
 						Name="VCCLCompilerTool"
+						WholeProgramOptimization="false"
 						PreprocessorDefinitions="HAVE_PTW32_CONFIG_H;PTW32_BUILD_INLINED;PTW32_STATIC_LIB;__CLEANUP_C;$(NOINHERIT)"
 					/>
 				</FileConfiguration>
diff --git a/Visual Studio Projects/VAX780.vcproj b/Visual Studio Projects/VAX780.vcproj
index a2425a5f..fdb15cc3 100644
--- a/Visual Studio Projects/VAX780.vcproj	
+++ b/Visual Studio Projects/VAX780.vcproj	
@@ -133,10 +133,12 @@
 				EnableIntrinsicFunctions="true"
 				FavorSizeOrSpeed="1"
 				OmitFramePointers="true"
+				WholeProgramOptimization="true"
 				AdditionalIncludeDirectories="./;../;../VAX/;../pdp11/;&quot;../../windows-build/winpcap/Wpdpack/Include&quot;;&quot;../../windows-build/pthreads&quot;"
 				PreprocessorDefinitions="USE_INT64;USE_ADDR64;VM_VAX;VAX_780;USE_SHARED;_CRT_NONSTDC_NO_WARNINGS;_CRT_SECURE_NO_WARNINGS;PTW32_STATIC_LIB;USE_READER_THREAD;SIM_ASYNCH_IO"
 				StringPooling="true"
 				RuntimeLibrary="0"
+				BufferSecurityCheck="false"
 				EnableFunctionLevelLinking="true"
 				UsePrecompiledHeader="0"
 				WarningLevel="3"
@@ -164,6 +166,7 @@
 				SubSystem="1"
 				OptimizeReferences="2"
 				EnableCOMDATFolding="2"
+				LinkTimeCodeGeneration="1"
 				RandomizedBaseAddress="1"
 				DataExecutionPrevention="0"
 				TargetMachine="1"
@@ -270,6 +273,7 @@
 					>
 					<Tool
 						Name="VCCLCompilerTool"
+						WholeProgramOptimization="false"
 						PreprocessorDefinitions="HAVE_PTW32_CONFIG_H;PTW32_BUILD_INLINED;PTW32_STATIC_LIB;__CLEANUP_C;$(NOINHERIT)"
 					/>
 				</FileConfiguration>