diff --git a/BUILD b/BUILD
index 4e04b8c..5fe252c 100644
--- a/BUILD
+++ b/BUILD
@@ -446,6 +446,7 @@
         "src/core/lib/support/env_linux.cc",
         "src/core/lib/support/env_posix.cc",
         "src/core/lib/support/env_windows.cc",
+        "src/core/lib/support/fork.cc",
         "src/core/lib/support/histogram.cc",
         "src/core/lib/support/host_port.cc",
         "src/core/lib/support/log.cc",
@@ -485,6 +486,7 @@
         "src/core/lib/support/atomic_with_atm.h",
         "src/core/lib/support/atomic_with_std.h",
         "src/core/lib/support/env.h",
+        "src/core/lib/support/fork.h",
         "src/core/lib/support/memory.h",
         "src/core/lib/support/vector.h",
         "src/core/lib/support/manual_constructor.h",
@@ -494,6 +496,7 @@
         "src/core/lib/support/stack_lockfree.h",
         "src/core/lib/support/string.h",
         "src/core/lib/support/string_windows.h",
+        "src/core/lib/support/thd_internal.h",
         "src/core/lib/support/time_precise.h",
         "src/core/lib/support/tmpfile.h",
     ],
@@ -513,6 +516,7 @@
         "include/grpc/impl/codegen/atm_gcc_atomic.h",
         "include/grpc/impl/codegen/atm_gcc_sync.h",
         "include/grpc/impl/codegen/atm_windows.h",
+        "include/grpc/impl/codegen/fork.h",
         "include/grpc/impl/codegen/gpr_slice.h",
         "include/grpc/impl/codegen/gpr_types.h",
         "include/grpc/impl/codegen/port_platform.h",
@@ -572,6 +576,8 @@
         "src/core/lib/iomgr/ev_windows.cc",
         "src/core/lib/iomgr/exec_ctx.cc",
         "src/core/lib/iomgr/executor.cc",
+        "src/core/lib/iomgr/fork_posix.cc",
+        "src/core/lib/iomgr/fork_windows.cc",
         "src/core/lib/iomgr/gethostname_fallback.cc",
         "src/core/lib/iomgr/gethostname_host_name_max.cc",
         "src/core/lib/iomgr/gethostname_sysconf.cc",