diff --git a/src/machine/m_at_socket7.c b/src/machine/m_at_socket7.c
index a3e777dbd..d61e4ba6e 100644
--- a/src/machine/m_at_socket7.c
+++ b/src/machine/m_at_socket7.c
@@ -532,7 +532,7 @@ machine_at_presario2240_init(const machine_t *model)
 
     machine_at_common_init_ex(model, 2);
 
-    pci_init(PCI_CONFIG_TYPE_1);
+    pci_init(PCI_CONFIG_TYPE_1 | FLAG_NO_BRIDGES);
     pci_register_slot(0x00, PCI_CARD_NORTHBRIDGE, 0, 0, 0, 0);
     pci_register_slot(0x07, PCI_CARD_SOUTHBRIDGE, 1, 2, 3, 4);
     pci_register_slot(0x14, PCI_CARD_VIDEO,       3, 0, 0, 0);
@@ -563,7 +563,7 @@ machine_at_presario4500_init(const machine_t *model)
 
     machine_at_common_init_ex(model, 2);
 
-    pci_init(PCI_CONFIG_TYPE_1);
+    pci_init(PCI_CONFIG_TYPE_1 | FLAG_NO_BRIDGES);
     pci_register_slot(0x00, PCI_CARD_NORTHBRIDGE, 0, 0, 0, 0);
     pci_register_slot(0x07, PCI_CARD_SOUTHBRIDGE, 1, 2, 3, 4);
     pci_register_slot(0x14, PCI_CARD_VIDEO,       3, 0, 0, 0);