diff --git a/dev/bus/pci/backend/ecam.h b/dev/bus/pci/backend/ecam.h
index 1786370b..039cd46d 100644
--- a/dev/bus/pci/backend/ecam.h
+++ b/dev/bus/pci/backend/ecam.h
@@ -32,7 +32,7 @@ private:
     status_t initialize();
 
     paddr_t base_;
-    __UNUSED uint16_t segment_;
+    uint16_t segment_;
     uint16_t start_bus_;
     uint16_t end_bus_;