diff --git a/tools/pci.hpp b/tools/pci.hpp
index 37cd736..0edc531 100644
--- a/tools/pci.hpp
+++ b/tools/pci.hpp
@@ -1,9 +1,11 @@
 #pragma once
 
-extern "C" {
+extern "C"
+{
 #include <pci/pci.h>
 } // extern "C"
 
+#include <cstdint>
 #include <optional>
 #include <vector>