initial commit
diff --git a/binding.gyp b/binding.gyp
index 582c612..1c2ff56 100644
--- a/binding.gyp
+++ b/binding.gyp
@@ -879,6 +879,7 @@
         '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',