diff --git a/windows/ZeroTierOne/ZeroTierOne.vcxproj b/windows/ZeroTierOne/ZeroTierOne.vcxproj
index d0e0a4d8..29f08874 100644
--- a/windows/ZeroTierOne/ZeroTierOne.vcxproj
+++ b/windows/ZeroTierOne/ZeroTierOne.vcxproj
@@ -296,7 +296,7 @@
       <SDLCheck>true</SDLCheck>
       <AdditionalIncludeDirectories>
       </AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>ZT_EXPORT;NOMINMAX;STATICLIB;WIN32;ZT_TRACE;ZT_USE_MINIUPNPC;MINIUPNP_STATICLIB;ZT_SOFTWARE_UPDATE_DEFAULT="disable";%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>ZT_EXPORT;FD_SETSIZE=1024;NOMINMAX;STATICLIB;WIN32;ZT_TRACE;ZT_USE_MINIUPNPC;MINIUPNP_STATICLIB;ZT_SOFTWARE_UPDATE_DEFAULT="disable";%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <DisableSpecificWarnings>4996</DisableSpecificWarnings>
     </ClCompile>
     <Link>
@@ -312,7 +312,7 @@
       <SDLCheck>true</SDLCheck>
       <AdditionalIncludeDirectories>
       </AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>ZT_EXPORT;NOMINMAX;STATICLIB;WIN32;ZT_TRACE;ZT_USE_MINIUPNPC;MINIUPNP_STATICLIB;ZT_SOFTWARE_UPDATE_DEFAULT="disable";%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>ZT_EXPORT;FD_SETSIZE=1024;NOMINMAX;STATICLIB;WIN32;ZT_TRACE;ZT_USE_MINIUPNPC;MINIUPNP_STATICLIB;ZT_SOFTWARE_UPDATE_DEFAULT="disable";%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <DisableSpecificWarnings>4996</DisableSpecificWarnings>
     </ClCompile>
     <Link>
@@ -328,7 +328,7 @@
       <SDLCheck>true</SDLCheck>
       <AdditionalIncludeDirectories>
       </AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>ZT_EXPORT;NOMINMAX;STATICLIB;WIN32;ZT_TRACE;ZT_RULES_ENGINE_DEBUGGING;ZT_USE_MINIUPNPC;MINIUPNP_STATICLIB;ZT_SOFTWARE_UPDATE_DEFAULT="disable";%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>ZT_EXPORT;FD_SETSIZE=1024;NOMINMAX;STATICLIB;WIN32;ZT_TRACE;ZT_RULES_ENGINE_DEBUGGING;ZT_USE_MINIUPNPC;MINIUPNP_STATICLIB;ZT_SOFTWARE_UPDATE_DEFAULT="disable";%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <MultiProcessorCompilation>false</MultiProcessorCompilation>
       <DisableSpecificWarnings>4996</DisableSpecificWarnings>
     </ClCompile>
@@ -346,7 +346,7 @@
       <SDLCheck>true</SDLCheck>
       <AdditionalIncludeDirectories>
       </AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>ZT_EXPORT;NOMINMAX;STATICLIB;WIN32;ZT_USE_MINIUPNPC;MINIUPNP_STATICLIB;ZT_SOFTWARE_UPDATE_DEFAULT="disable";%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>ZT_EXPORT;FD_SETSIZE=1024;NOMINMAX;STATICLIB;WIN32;ZT_USE_MINIUPNPC;MINIUPNP_STATICLIB;ZT_SOFTWARE_UPDATE_DEFAULT="disable";%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <MultiProcessorCompilation>false</MultiProcessorCompilation>
       <DisableSpecificWarnings>4996</DisableSpecificWarnings>
     </ClCompile>
@@ -366,7 +366,7 @@
       <SDLCheck>true</SDLCheck>
       <AdditionalIncludeDirectories>
       </AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>ZT_EXPORT;STATICLIB;ZT_SALSA20_SSE;ZT_USE_MINIUPNPC;MINIUPNP_STATICLIB;WIN32;NOMINMAX;ZT_SOFTWARE_UPDATE_DEFAULT="apply";ZT_BUILD_PLATFORM=2;ZT_BUILD_ARCHITECTURE=1;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>ZT_EXPORT;FD_SETSIZE=1024;STATICLIB;ZT_SALSA20_SSE;ZT_USE_MINIUPNPC;MINIUPNP_STATICLIB;WIN32;NOMINMAX;ZT_SOFTWARE_UPDATE_DEFAULT="apply";ZT_BUILD_PLATFORM=2;ZT_BUILD_ARCHITECTURE=1;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
       <EnableEnhancedInstructionSet>StreamingSIMDExtensions2</EnableEnhancedInstructionSet>
       <StringPooling>true</StringPooling>
@@ -393,7 +393,7 @@
       <SDLCheck>true</SDLCheck>
       <AdditionalIncludeDirectories>
       </AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>ZT_EXPORT;STATICLIB;ZT_SOFTWARE_UPDATE_DEFAULT="apply";ZT_SALSA20_SSE;ZT_USE_MINIUPNPC;MINIUPNP_STATICLIB;WIN32;NOMINMAX;ZT_BUILD_PLATFORM=2;ZT_BUILD_ARCHITECTURE=2;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>ZT_EXPORT;FD_SETSIZE=1024;STATICLIB;ZT_SOFTWARE_UPDATE_DEFAULT="apply";ZT_SALSA20_SSE;ZT_USE_MINIUPNPC;MINIUPNP_STATICLIB;WIN32;NOMINMAX;ZT_BUILD_PLATFORM=2;ZT_BUILD_ARCHITECTURE=2;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
       <EnableEnhancedInstructionSet>NotSet</EnableEnhancedInstructionSet>
       <StringPooling>true</StringPooling>