1 files changed, 1 insertions, 1 deletions
diff --git a/src/format.h b/src/format.h
index fc1272aa..a2bf1015 100644
--- a/src/format.h
+++ b/src/format.h
@@ -132,7 +132,7 @@ public:
     if (! _str.empty())
       parse_format(_str);
   }
-  ~format_t() {
+  virtual ~format_t() {
     TRACE_DTOR(format_t);
   }