diff --git a/hwloc/topology-linux.c b/hwloc/topology-linux.c
index 0d89cf4b58..a3c165173b 100644
--- a/hwloc/topology-linux.c
+++ b/hwloc/topology-linux.c
@@ -5890,7 +5890,7 @@ hwloc_look_linuxfs_io(struct hwloc_backend *backend)
   enum hwloc_type_filter_e pfilter, bfilter, ofilter, mfilter;
   int root_fd = -1;
 #ifdef HWLOC_HAVE_LINUXPCI
-  struct hwloc_obj *tmp;
+  struct hwloc_obj *child;
   int needpcidiscovery;
 #endif
 
@@ -5928,10 +5928,12 @@ hwloc_look_linuxfs_io(struct hwloc_backend *backend)
    * (they are attached to root until later in the core discovery)
    */
   needpcidiscovery = 1;
-  for_each_io_child(tmp, hwloc_get_root_obj(topology)) {
-    if (tmp->type == HWLOC_OBJ_PCI_DEVICE
-	|| (tmp->type == HWLOC_OBJ_BRIDGE && tmp->attr->bridge.downstream_type == HWLOC_OBJ_BRIDGE_PCI)) {
-      hwloc_debug("%s", "PCI objects already added, ignoring linuxio PCI discovery.\n");
+  for_each_io_child(child, hwloc_get_root_obj(topology)) {
+    if (child->type == HWLOC_OBJ_PCI_DEVICE
+	|| (child->type == HWLOC_OBJ_BRIDGE &&
+	    (child->attr->bridge.upstream_type == HWLOC_OBJ_BRIDGE_PCI
+	     || child->attr->bridge.downstream_type == HWLOC_OBJ_BRIDGE_PCI))) {
+      hwloc_debug("%s", "Topology already contains PCI objects, skipping linuxio PCI discovery.\n");
       needpcidiscovery = 0;
       break;
     }
diff --git a/hwloc/topology-pci.c b/hwloc/topology-pci.c
index 3195797d52..ef5840a150 100644
--- a/hwloc/topology-pci.c
+++ b/hwloc/topology-pci.c
@@ -92,7 +92,7 @@ hwloc_look_pci(struct hwloc_backend *backend)
 {
   struct hwloc_topology *topology = backend->topology;
   enum hwloc_type_filter_e pfilter, bfilter;
-  struct hwloc_obj *tree = NULL, *tmp;
+  struct hwloc_obj *tree = NULL, *child;
   int ret;
   struct pci_device_iterator *iter;
   struct pci_device *pcidev;
@@ -106,14 +106,14 @@ hwloc_look_pci(struct hwloc_backend *backend)
   /* don't do anything if another backend attached PCI already
    * (they are attached to root until later in the core discovery)
    */
-  tmp = hwloc_get_root_obj(topology)->io_first_child;
-  while (tmp) {
-    if (tmp->type == HWLOC_OBJ_PCI_DEVICE
-	|| (tmp->type == HWLOC_OBJ_BRIDGE && tmp->attr->bridge.downstream_type == HWLOC_OBJ_BRIDGE_PCI)) {
-      hwloc_debug("%s", "PCI objects already added, ignoring linuxpci backend.\n");
+  for_each_io_child(child, hwloc_get_root_obj(topology)) {
+    if (child->type == HWLOC_OBJ_PCI_DEVICE
+       || (child->type == HWLOC_OBJ_BRIDGE &&
+	   (child->attr->bridge.upstream_type == HWLOC_OBJ_BRIDGE_PCI
+	    || child->attr->bridge.downstream_type == HWLOC_OBJ_BRIDGE_PCI))) {
+      hwloc_debug("%s", "Topology already contains PCI objects, skipping PCI backend.\n");
       return 0;
     }
-    tmp = tmp->next_sibling;
   }
 
   hwloc_debug("%s", "\nScanning PCI buses...\n");