Fix compiler warning.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/file.h b/src/file.h
index 845130e..ab2ad4c 100644
--- a/src/file.h
+++ b/src/file.h
@@ -43,7 +43,7 @@ class File {
 public:
   File(Info* info); // Empty constructor for unit tests.
   File(const char *filename, const char* ext, Info* info);
-  ~File();
+  virtual ~File();
 
   virtual int Write(void* data, int size);
   /*