diff --git a/CorebootPayloadPkg/Library/PciHostBridgeLib/PciHostBridgeSupport.c b/CorebootPayloadPkg/Library/PciHostBridgeLib/PciHostBridgeSupport.c
index 6d94ff72c9..18dcbafdf0 100644
--- a/CorebootPayloadPkg/Library/PciHostBridgeLib/PciHostBridgeSupport.c
+++ b/CorebootPayloadPkg/Library/PciHostBridgeLib/PciHostBridgeSupport.c
@@ -328,8 +328,13 @@ ScanForRootBridges (
   for (PrimaryBus = 0; PrimaryBus <= PCI_MAX_BUS; PrimaryBus = SubBus + 1) {
     SubBus = PrimaryBus;
     Attributes = 0;
+
+    ZeroMem (&Io, sizeof (Io));
+    ZeroMem (&Mem, sizeof (Mem));
+    ZeroMem (&MemAbove4G, sizeof (MemAbove4G));
+    ZeroMem (&PMem, sizeof (PMem));
+    ZeroMem (&PMemAbove4G, sizeof (PMemAbove4G));
     Io.Base = Mem.Base = MemAbove4G.Base = PMem.Base = PMemAbove4G.Base = MAX_UINT64;
-    Io.Limit = Mem.Limit = MemAbove4G.Limit = PMem.Limit = PMemAbove4G.Limit = 0;
     //
     // Scan all the PCI devices on the primary bus of the PCI root bridge
     //