diff --git a/src/backend/common/misc/PciTopology.h b/src/backend/common/misc/PciTopology.h
index ce33ebdb..ee531f50 100644
--- a/src/backend/common/misc/PciTopology.h
+++ b/src/backend/common/misc/PciTopology.h
@@ -40,12 +40,12 @@ class PciTopology
 {
 public:
     PciTopology() = default;
-    PciTopology(uint32_t bus, uint32_t device, uint32_t function) : m_bus(bus), m_device(device), m_function(function) {}
+    PciTopology(uint32_t bus, uint32_t device, uint32_t function) : m_valid(true), m_bus(bus), m_device(device), m_function(function) {}
 
-    inline bool isValid() const         { return m_bus >= 0; }
-    inline uint32_t bus() const         { return isValid() ? m_bus : 0; }
-    inline uint32_t device() const      { return m_device; }
-    inline uint32_t function() const    { return m_function; }
+    inline bool isValid() const        { return m_valid; }
+    inline uint8_t bus() const         { return m_bus; }
+    inline uint8_t device() const      { return m_device; }
+    inline uint8_t function() const    { return m_function; }
 
     String toString() const
     {
@@ -60,9 +60,10 @@ public:
     }
 
 private:
-    int32_t m_bus         = -1;
-    uint32_t m_device     = 0;
-    uint32_t m_function   = 0;
+    bool m_valid         = false;
+    uint8_t m_bus        = 0;
+    uint8_t m_device     = 0;
+    uint8_t m_function   = 0;
 };