diff --git a/xf86drmMode.c b/xf86drmMode.c
index 2399e8ec..6fa2e83f 100644
--- a/xf86drmMode.c
+++ b/xf86drmMode.c
@@ -800,19 +800,11 @@ drm_public int drmCheckModesettingSupported(const char *busid)
 	if (found)
 		return 0;
 #elif defined (__FreeBSD__) || defined (__FreeBSD_kernel__)
-	char kbusid[1024], sbusid[1024];
+	char sbusid[1024];
 	char oid[128];
-	int domain, bus, dev, func;
 	int i, modesetting, ret;
 	size_t len;
 
-	ret = sscanf(busid, "pci:%04x:%02x:%02x.%d", &domain, &bus, &dev,
-	    &func);
-	if (ret != 4)
-		return -EINVAL;
-	snprintf(kbusid, sizeof(kbusid), "pci:%04x:%02x:%02x.%d", domain, bus,
-	    dev, func);
-
 	/* How many GPUs do we expect in the machine ? */
 	for (i = 0; i < 16; i++) {
 		snprintf(oid, sizeof(oid), "hw.dri.%d.busid", i);
@@ -823,7 +815,7 @@ drm_public int drmCheckModesettingSupported(const char *busid)
 				continue;
 			return -EINVAL;
 		}
-		if (strcmp(sbusid, kbusid) != 0)
+		if (strcmp(sbusid, busid) != 0)
 			continue;
 		snprintf(oid, sizeof(oid), "hw.dri.%d.modesetting", i);
 		len = sizeof(modesetting);