diff --git a/Kernel/PCI/Definitions.h b/Kernel/PCI/Definitions.h
index 7c003f331fa..767ff73cc19 100644
--- a/Kernel/PCI/Definitions.h
+++ b/Kernel/PCI/Definitions.h
@@ -89,7 +89,7 @@ inline const LogStream& operator<<(const LogStream& stream, const ID value)
 }
 struct Address {
 public:
-    Address() {}
+    Address() { }
     Address(u16 seg)
         : m_seg(seg)
         , m_bus(0)
@@ -116,6 +116,13 @@ public:
     bool is_null() const { return !m_bus && !m_slot && !m_function; }
     operator bool() const { return !is_null(); }
 
+    // Disable default implementations that would use surprising integer promotion.
+    bool operator==(const Address&) const = delete;
+    bool operator<=(const Address&) const = delete;
+    bool operator>=(const Address&) const = delete;
+    bool operator<(const Address&) const = delete;
+    bool operator>(const Address&) const = delete;
+
     u16 seg() const { return m_seg; }
     u8 bus() const { return m_bus; }
     u8 slot() const { return m_slot; }