diff --git a/pci_handler.hpp b/pci_handler.hpp
index 2594f09..ba09d51 100644
--- a/pci_handler.hpp
+++ b/pci_handler.hpp
@@ -22,6 +22,7 @@
   public:
     PciDataHandler() = default;
 
+    bool open() override;
     std::vector<std::uint8_t> copyFrom(std::uint32_t length) override;
     bool write(const std::vector<std::uint8_t>& configuration) override;
     std::vector<std::uint8_t> read() override;