diff --git a/fxbarcode/datamatrix/BC_SymbolInfo.h b/fxbarcode/datamatrix/BC_SymbolInfo.h
index ce40f74..fff9c04 100644
--- a/fxbarcode/datamatrix/BC_SymbolInfo.h
+++ b/fxbarcode/datamatrix/BC_SymbolInfo.h
@@ -10,6 +10,8 @@
 #include <stddef.h>
 #include <stdint.h>
 
+#include "core/fxcrt/unowned_ptr.h"
+
 class CBC_SymbolInfo {
  public:
   struct Data {
@@ -52,7 +54,7 @@
     return data_->matrix_width != data_->matrix_height;
   }
 
-  const Data* const data_;
+  UnownedPtr<const Data> const data_;
 };
 
 #endif  // FXBARCODE_DATAMATRIX_BC_SYMBOLINFO_H_