--- src/third_party/libbson/BUILD.bazel.orig
+++ src/third_party/libbson/BUILD.bazel
@@ -37,6 +37,7 @@ mongo_cc_library(
         "@platforms//os:windows": glob(["build_windows/**/*.h"]),
         "@platforms//os:macos": glob(["build_osx/**/*.h"]),
         "@platforms//os:linux": glob(["build_linux/**/*.h"]),
+        "@platforms//os:freebsd": glob(["build_osx/**/*.h"]),
         "//bazel/config:linux_s390x": glob(["build_linux_s390x/**/*.h"]),
         "//conditions:default": [],
     }),
@@ -54,6 +55,10 @@ mongo_cc_library(
             "-Wno-unguarded-availability-new",
             "-Wno-implicit-fallthrough",
         ],
+        "@platforms//os:freebsd": [
+            "-Wno-sign-compare",
+            "-Wno-implicit-fallthrough",
+        ],
         "@platforms//os:linux": [
             "-Wno-sign-compare",
             "-Wno-implicit-fallthrough",
@@ -76,6 +81,10 @@ mongo_cc_library(
             "build_osx",
             "build_osx/bson",
         ],
+        "@platforms//os:freebsd": [
+            "build_osx",
+            "build_osx/bson",
+        ],
         "@platforms//os:linux": [
             "build_linux",
             "build_linux/bson",