--- src/third_party/boost/BUILD.bazel.orig
+++ src/third_party/boost/BUILD.bazel
@@ -126,6 +126,10 @@ mongo_cc_library(
             "libs/thread/src/pthread/once.cpp",
             "libs/thread/src/pthread/thread.cpp",
         ],
+        "@platforms//os:freebsd": [
+            "libs/thread/src/pthread/once.cpp",
+            "libs/thread/src/pthread/thread.cpp",
+        ],
         "@platforms//os:windows": [
             "libs/thread/src/win32/thread.cpp",
             "libs/thread/src/win32/thread_primitives.cpp",
@@ -140,6 +144,9 @@ mongo_cc_library(
         "@platforms//os:macos": [
             "libs/thread/src/pthread/once_atomic.cpp",
         ],
+        "@platforms//os:freebsd": [
+            "libs/thread/src/pthread/once_atomic.cpp",
+        ],
         "//conditions:default": [],
     }),
     copts = BOOST_COPTS,
@@ -151,6 +158,9 @@ mongo_cc_library(
         "@platforms//os:macos": [
             "BOOST_THREAD_PTHREAD",
         ],
+        "@platforms//os:freebsd": [
+            "BOOST_THREAD_PTHREAD",
+        ],
         "@platforms//os:windows": [
             "BOOST_THREAD_WIN32",
         ],