diff --git a/src/core/ext/census/tracing.c b/src/core/ext/census/tracing.c
index 8f0e12296ddc13b7b7a8608f7efe462f26744fe0..3b5d6dab2b8d775f1624e5f922f9f692e66b98ea 100644
--- a/src/core/ext/census/tracing.c
+++ b/src/core/ext/census/tracing.c
@@ -31,19 +31,15 @@
  *
  */
 
-//#include "src/core/ext/census/tracing.h"
-
 #include <grpc/census.h>
 
 /* TODO(aveitch): These are all placeholder implementations. */
 
-// int census_trace_mask(const census_context *context) {
-//   return CENSUS_TRACE_MASK_NONE;
-// }
-
-// void census_set_trace_mask(int trace_mask) {}
+int census_trace_mask(const census_context *context) {
+  return CENSUS_TRACE_MASK_NONE;
+}
 
-// void census_trace_print(census_context *context, uint32_t type,
-//                         const char *buffer, size_t n) {}
+void census_set_trace_mask(int trace_mask) {}
 
-// void SetTracerParams(const Params& params);
+void census_trace_print(census_context *context, uint32_t type,
+                        const char *buffer, size_t n) {}