diff --git a/Visual Studio Projects/PDP10-KL.vcproj b/Visual Studio Projects/PDP10-KL.vcproj
index 29d3a493..0604437f 100644
--- a/Visual Studio Projects/PDP10-KL.vcproj	
+++ b/Visual Studio Projects/PDP10-KL.vcproj	
@@ -41,7 +41,7 @@
 				Name="VCCLCompilerTool"
 				Optimization="0"
 				AdditionalIncludeDirectories="../PDP10;.;..;../slirp;../slirp_glue;../slirp_glue/qemu;../slirp_glue/qemu/win32/include;../../windows-build/include;;../../windows-build/include/SDL2"
-				PreprocessorDefinitions="USE_INT64;USE_SIM_CARD;KL=1;USE_SHARED;HAVE_SLIRP_NETWORK;USE_SIMH_SLIRP_DEBUG;SIM_BUILD_TOOL=simh-Visual-Studio-Project;_CRT_NONSTDC_NO_WARNINGS;_CRT_SECURE_NO_WARNINGS;_WINSOCK_DEPRECATED_NO_WARNINGS;SIM_NEED_GIT_COMMIT_ID;HAVE_PCRE_H;PCRE_STATIC"
+				PreprocessorDefinitions="USE_INT64;USE_SIM_CARD;KL=1;USE_SHARED;HAVE_SLIRP_NETWORK;USE_SIMH_SLIRP_DEBUG;SIM_BUILD_TOOL=simh-Visual-Studio-Project;_CRT_NONSTDC_NO_WARNINGS;_CRT_SECURE_NO_WARNINGS;_WINSOCK_DEPRECATED_NO_WARNINGS;SIM_NEED_GIT_COMMIT_ID;HAVE_PCRE_H;PCRE_STATIC;PTW32_STATIC_LIB;USE_READER_THREAD;SIM_ASYNCH_IO"
 				KeepComments="false"
 				BasicRuntimeChecks="0"
 				RuntimeLibrary="1"
@@ -126,7 +126,7 @@
 				OmitFramePointers="true"
 				WholeProgramOptimization="true"
 				AdditionalIncludeDirectories="../PDP10;.;..;../slirp;../slirp_glue;../slirp_glue/qemu;../slirp_glue/qemu/win32/include;../../windows-build/include;;../../windows-build/include/SDL2"
-				PreprocessorDefinitions="USE_INT64;USE_SIM_CARD;KL=1;USE_SHARED;HAVE_SLIRP_NETWORK;USE_SIMH_SLIRP_DEBUG;SIM_BUILD_TOOL=simh-Visual-Studio-Project;_CRT_NONSTDC_NO_WARNINGS;_CRT_SECURE_NO_WARNINGS;_WINSOCK_DEPRECATED_NO_WARNINGS;SIM_NEED_GIT_COMMIT_ID;HAVE_PCRE_H;PCRE_STATIC"
+				PreprocessorDefinitions="USE_INT64;USE_SIM_CARD;KL=1;USE_SHARED;HAVE_SLIRP_NETWORK;USE_SIMH_SLIRP_DEBUG;SIM_BUILD_TOOL=simh-Visual-Studio-Project;_CRT_NONSTDC_NO_WARNINGS;_CRT_SECURE_NO_WARNINGS;_WINSOCK_DEPRECATED_NO_WARNINGS;SIM_NEED_GIT_COMMIT_ID;HAVE_PCRE_H;PCRE_STATIC;PTW32_STATIC_LIB;USE_READER_THREAD;SIM_ASYNCH_IO"
 				StringPooling="true"
 				RuntimeLibrary="0"
 				EnableFunctionLevelLinking="true"