diff --git a/include/noun/trace.h b/include/noun/trace.h
index e8ba7348a4..0654862d0a 100644
--- a/include/noun/trace.h
+++ b/include/noun/trace.h
@@ -107,7 +107,7 @@
     /* u3t_event_trace(): record a lifecycle event.
     */
       void
-      u3t_event_trace(const char* name, char type);
+      u3t_event_trace(const c3_c* name, c3_c type);
 
     /* u3t_damp(): print and clear profile data.
     */
diff --git a/noun/trace.c b/noun/trace.c
index 4ef31bb5e6..30c3a31a93 100644
--- a/noun/trace.c
+++ b/noun/trace.c
@@ -470,7 +470,7 @@ u3t_nock_trace_pop()
 /* u3t_event_trace(): dumps a simple event from outside nock.
 */
 void
-u3t_event_trace(const char* name, char type)
+u3t_event_trace(const c3_c* name, c3_c type)
 {
   if (!trace_file_u)
     return;