diff --git a/hw/kdrive/linux/bus.c b/hw/kdrive/linux/bus.c
index ba8a6cd43..93c3ea5f3 100644
--- a/hw/kdrive/linux/bus.c
+++ b/hw/kdrive/linux/bus.c
@@ -72,7 +72,7 @@ BusInit (KdPointerInfo *pi)
     {
         for (i = 0; i < NUM_BUS_NAMES; i++)
         {
-            if ((fd = open (BusNames[i], 0)) > 0)
+            if ((fd = open (BusNames[i], 0)) >= 0)
             {
                 close(fd);
                 if (pi->path)
@@ -84,7 +84,7 @@ BusInit (KdPointerInfo *pi)
     }
     else
     {
-        if ((fd = open(pi->path, 0)) > 0)
+        if ((fd = open(pi->path, 0)) >= 0)
         {
             close(fd);
             return Success;
@@ -99,7 +99,7 @@ BusEnable (KdPointerInfo *pi)
 {
     int fd = open(pi->path, 0);
 
-    if (fd > 0)
+    if (fd >= 0)
     {
         KdRegisterFd(fd, BusRead, pi);
         pi->driverPrivate = (void *)fd;
diff --git a/hw/xfree86/common/xf86Configure.c b/hw/xfree86/common/xf86Configure.c
index bce5aae58..3b7828a3f 100644
--- a/hw/xfree86/common/xf86Configure.c
+++ b/hw/xfree86/common/xf86Configure.c
@@ -253,7 +253,7 @@ configureInputSection (void)
 	int fd;
 #ifdef WSCONS_SUPPORT
 	fd = open("/dev/wsmouse", 0);
-	if (fd > 0) {
+	if (fd >= 0) {
 	    DFLT_MOUSE_DEV = "/dev/wsmouse";
 	    DFLT_MOUSE_PROTO = "wsmouse";
 	    close(fd);
diff --git a/hw/xfree86/os-support/linux/lnx_video.c b/hw/xfree86/os-support/linux/lnx_video.c
index 73409dfba..09d178797 100644
--- a/hw/xfree86/os-support/linux/lnx_video.c
+++ b/hw/xfree86/os-support/linux/lnx_video.c
@@ -336,7 +336,7 @@ mtrr_undo_wc_region(int screenNum, struct mtrr_wc_region *wcr)
 {
 	struct mtrr_wc_region *p, *prev;
 
-	if (mtrr_fd > 0) {
+	if (mtrr_fd >= 0) {
 		p = wcr;
 		while (p) {
 			if (p->added)