diff --git a/CMakeLists.txt b/CMakeLists.txt
index b97a5262..95e82ef1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -557,6 +557,16 @@ elseif(APPLE)
   message(STATUS "BACNET: building for APPLE")
   set(BACNET_PORT_DIRECTORY_PATH ${CMAKE_CURRENT_LIST_DIR}/ports/bsd)
 
+  target_sources(${PROJECT_NAME} PRIVATE
+    ports/bsd/bacport.h
+    ports/bsd/bip-init.c
+    ports/bsd/datetime-init.c
+    ports/bsd/mstimer-init.c
+    ports/bsd/stdbool.h)
+elseif(${CMAKE_SYSTEM_NAME} STREQUAL "FreeBSD")
+  message(STATUS "BACNET: building for FreeBSD")
+  set(BACNET_PORT_DIRECTORY_PATH ${CMAKE_CURRENT_LIST_DIR}/ports/bsd)
+
   target_sources(${PROJECT_NAME} PRIVATE
     ports/bsd/bacport.h
     ports/bsd/bip-init.c