1 files changed, 2 insertions, 0 deletions
diff --git a/mask.cc b/mask.cc
index 959df8ea..b9bd5cff 100644
--- a/mask.cc
+++ b/mask.cc
@@ -35,6 +35,8 @@ namespace ledger {
 
 mask_t::mask_t(const string& pat) : exclude(false)
 {
+  TRACE_CTOR(mask_t, "const string&");
+
   const char * p = pat.c_str();
 
   if (*p == '-') {