diff --git a/windows/Alethzero.vcxproj b/windows/Alethzero.vcxproj
index 06c78c4da..721c0729e 100644
--- a/windows/Alethzero.vcxproj
+++ b/windows/Alethzero.vcxproj
@@ -87,7 +87,7 @@
     <ClCompile>
       <PrecompiledHeader>Use</PrecompiledHeader>
       <Optimization>Disabled</Optimization>
-      <PreprocessorDefinitions>WIN32;_DEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>WIN32;_WINSOCK_DEPRECATED_NO_WARNINGS;_DEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <ForcedIncludeFiles>stdafx.h</ForcedIncludeFiles>
@@ -126,7 +126,7 @@
       <Optimization>MaxSpeed</Optimization>
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>
-      <PreprocessorDefinitions>WIN32;NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>WIN32;_WINSOCK_DEPRECATED_NO_WARNINGS;NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
       <StringPooling>true</StringPooling>
       <InlineFunctionExpansion>AnySuitable</InlineFunctionExpansion>
diff --git a/windows/LibMiniUPnPc.vcxproj b/windows/LibMiniUPnPc.vcxproj
index 865b6c74d..7e5e44412 100644
--- a/windows/LibMiniUPnPc.vcxproj
+++ b/windows/LibMiniUPnPc.vcxproj
@@ -106,7 +106,7 @@
       </PrecompiledHeader>
       <Optimization>Disabled</Optimization>
       <RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
-      <PreprocessorDefinitions>_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>_CRT_SECURE_NO_WARNINGS;_WINSOCK_DEPRECATED_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <DisableSpecificWarnings>4100;4244;4245;4267;4389;%(DisableSpecificWarnings)</DisableSpecificWarnings>
     </ClCompile>
     <Link>
@@ -142,7 +142,7 @@
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
-      <PreprocessorDefinitions>_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>_CRT_SECURE_NO_WARNINGS;_WINSOCK_DEPRECATED_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <DisableSpecificWarnings>4100;4244;4245;4267;4389;%(DisableSpecificWarnings)</DisableSpecificWarnings>
     </ClCompile>
     <Link>