diff --git a/tracetools/include/tracetools/tracetools.h b/tracetools/include/tracetools/tracetools.h
index a03079e..26c8fd4 100644
--- a/tracetools/include/tracetools/tracetools.h
+++ b/tracetools/include/tracetools/tracetools.h
@@ -125,14 +125,6 @@ void TRACEPOINT(
   const void * callback,
   const bool is_intra_process);
 
-/**
- * tp: callback_start
- * (is_intra_process=false)
- */
-void TRACEPOINT(
-  callback_start,
-  const void * callback);
-
 /**
  * tp: callback_end
  */
diff --git a/tracetools/src/tracetools.c b/tracetools/src/tracetools.c
index 668cac0..97123e7 100644
--- a/tracetools/src/tracetools.c
+++ b/tracetools/src/tracetools.c
@@ -183,17 +183,6 @@ void TRACEPOINT(
     (is_intra_process ? 1 : 0));
 }
 
-void TRACEPOINT(
-  callback_start,
-  const void * callback)
-{
-  CONDITIONAL_TP(
-    ros2,
-    callback_start,
-    callback,
-    0);
-}
-
 void TRACEPOINT(
   callback_end,
   const void * callback)