diff --git a/pci_handler.cpp b/pci_handler.cpp
index ecdafd1..436c63e 100644
--- a/pci_handler.cpp
+++ b/pci_handler.cpp
@@ -70,6 +70,7 @@
     {
         sys->close(mappedFd);
         mappedFd = -1;
+        mapped = nullptr;
 
         return false;
     }