--- src/third_party/libmongocrypt/BUILD.bazel.orig
+++ src/third_party/libmongocrypt/BUILD.bazel
@@ -35,6 +35,14 @@ CRYPTO_CONFIGS = {
             "dist/src/crypto/libcrypto.c",
         ],
     },
+    "//bazel/config:ssl_enabled_freebsd": {
+        "local_defines": ["KMS_MESSAGE_ENABLE_CRYPTO_LIBCRYPTO"],
+        "includes": ["build_libcrypto"],
+        "srcs": [
+            "dist/kms-message/src/kms_crypto_libcrypto.c",
+            "dist/src/crypto/libcrypto.c",
+        ],
+    },
 }
 
 CRYPTO_SRCS = select({
@@ -142,6 +150,7 @@ mongo_cc_library(
             "linux",
         ]
     } | {
+        "@platforms//os:freebsd": ["build_linux/mongocrypt-export.h"],
         "//conditions:default": ["//conditions:incompatible"],
     }),
     copts = [
@@ -174,6 +183,7 @@ mongo_cc_library(
             "linux",
         ]
     } | {
+        "@platforms//os:freebsd": ["build_linux"],
         "//conditions:default": ["//conditions:incompatible"],
     }) + CRYPTO_INCLUDES,
     linkopts = select({