diff --git a/tools/io.hpp b/tools/io.hpp
index 0712694..44cd2cb 100644
--- a/tools/io.hpp
+++ b/tools/io.hpp
@@ -47,14 +47,7 @@
     {
     }
 
-    /* On destruction, close /dev/mem if it was open. */
-    ~DevMemDevice()
-    {
-        if (opened)
-        {
-            sys->close(devMemFd);
-        }
-    }
+    ~DevMemDevice() = default;
 
     /* Don't allow copying or assignment, only moving. */
     DevMemDevice(const DevMemDevice&) = delete;
@@ -70,7 +63,6 @@
 
   private:
     static const std::string devMemPath;
-    bool opened = false;
     int devMemFd = -1;
     void* devMemMapped = nullptr;
     const internal::Sys* sys;