diff --git a/hw/xfree86/int10/generic.c b/hw/xfree86/int10/generic.c
index 012d194..8d5c4da 100644
--- a/hw/xfree86/int10/generic.c
+++ b/hw/xfree86/int10/generic.c
@@ -104,7 +104,7 @@  readIntVec(struct pci_device *dev, unsigned char *buf, int len)
 {
     void *map;
 
-    if (!pci_device_map_legacy(dev, 0, len, 0, &map))
+    if (pci_device_map_legacy(dev, 0, len, 0, &map))
         return FALSE;
 
     memcpy(buf, map, len);
diff --git a/hw/xfree86/os-support/linux/int10/linux.c b/hw/xfree86/os-support/linux/int10/linux.c
index 79b9a88..6ca118f 100644
--- a/hw/xfree86/os-support/linux/int10/linux.c
+++ b/hw/xfree86/os-support/linux/int10/linux.c
@@ -75,7 +75,7 @@  readLegacy(struct pci_device *dev, unsigned char *buf, int base, int len)
 {
     void *map;
 
-    if (!pci_device_map_legacy(dev, base, len, 0, &map))
+    if (pci_device_map_legacy(dev, base, len, 0, &map))
         return FALSE;
 
     memcpy(buf, map, len);