initial commit
diff --git a/BUILD b/BUILD
index 0339c87..eac5e62 100644
--- a/BUILD
+++ b/BUILD
@@ -282,6 +282,7 @@
         "src/core/ext/census/grpc_filter.c",
         "src/core/ext/census/grpc_plugin.c",
         "src/core/ext/census/initialize.c",
+        "src/core/ext/census/intrusive_hash_map.c",
         "src/core/ext/census/mlog.c",
         "src/core/ext/census/operation.c",
         "src/core/ext/census/placeholders.c",
@@ -297,6 +298,7 @@
         "src/core/ext/census/gen/census.pb.h",
         "src/core/ext/census/gen/trace_context.pb.h",
         "src/core/ext/census/grpc_filter.h",
+        "src/core/ext/census/intrusive_hash_map.c",
         "src/core/ext/census/mlog.h",
         "src/core/ext/census/resource.h",
         "src/core/ext/census/rpc_metric_id.h",