diff --git a/ports/win32/Microsoft Visual Studio 2019/BACnet_Stack_Library/BACnet_Stack_Library.vcxproj b/ports/win32/Microsoft Visual Studio 2019/BACnet_Stack_Library/BACnet_Stack_Library.vcxproj
index e2a343f9..58536e90 100644
--- a/ports/win32/Microsoft Visual Studio 2019/BACnet_Stack_Library/BACnet_Stack_Library.vcxproj	
+++ b/ports/win32/Microsoft Visual Studio 2019/BACnet_Stack_Library/BACnet_Stack_Library.vcxproj	
@@ -273,6 +273,7 @@
     <ClInclude Include="..\..\..\..\src\bacnet\key.h" />
     <ClInclude Include="..\..\..\..\src\bacnet\keylist.h" />
     <ClInclude Include="..\..\..\..\src\bacnet\lighting.h" />
+    <ClInclude Include="..\..\..\..\src\bacnet\hostnport.h" />
     <ClInclude Include="..\..\..\..\src\bacnet\lso.h" />
     <ClInclude Include="..\..\..\..\src\bacnet\memcopy.h" />
     <ClInclude Include="..\..\..\..\src\bacnet\mstp.h" />
diff --git a/ports/win32/Microsoft Visual Studio 2019/BACnet_Stack_Library/BACnet_Stack_Library.vcxproj.filters b/ports/win32/Microsoft Visual Studio 2019/BACnet_Stack_Library/BACnet_Stack_Library.vcxproj.filters
index c68efa7c..7f01f612 100644
--- a/ports/win32/Microsoft Visual Studio 2019/BACnet_Stack_Library/BACnet_Stack_Library.vcxproj.filters	
+++ b/ports/win32/Microsoft Visual Studio 2019/BACnet_Stack_Library/BACnet_Stack_Library.vcxproj.filters	
@@ -353,6 +353,9 @@
     <ClInclude Include="..\..\..\..\src\bacnet\lighting.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\..\..\src\bacnet\hostnport.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
     <ClInclude Include="..\..\..\..\src\bacnet\lso.h">
       <Filter>Header Files</Filter>
     </ClInclude>
diff --git a/zephyr/CMakeLists.txt b/zephyr/CMakeLists.txt
index 68ae6ff3..850f2e8b 100644
--- a/zephyr/CMakeLists.txt
+++ b/zephyr/CMakeLists.txt
@@ -261,6 +261,8 @@ set(BACNETSTACK_SRCS
     ${BACNETSTACK_SRC}/bacnet/get_alarm_sum.h
     ${BACNETSTACK_SRC}/bacnet/getevent.c
     ${BACNETSTACK_SRC}/bacnet/getevent.h
+    ${BACNETSTACK_SRC}/bacnet/hostnport.c
+    ${BACNETSTACK_SRC}/bacnet/hostnport.h
     ${BACNETSTACK_SRC}/bacnet/iam.c
     ${BACNETSTACK_SRC}/bacnet/iam.h
     ${BACNETSTACK_SRC}/bacnet/ihave.c