diff -Nur xf86-input-mouse-1.8.1.orig/src/bsd_mouse.c xf86-input-mouse-1.8.1/src/bsd_mouse.c
--- xf86-input-mouse-1.8.1.orig/src/bsd_mouse.c	2012-05-28 09:01:45.000000000 +0900
+++ xf86-input-mouse-1.8.1/src/bsd_mouse.c	2012-09-20 22:27:36.167583000 +0900
@@ -139,10 +139,10 @@
 {
     int i;
 
-    for (i = 0; internalNames[i]; i++)
+    for (i = 0; i < (sizeof(internalNames) / sizeof(internalNames[0])) - 1; i++)
         if (xf86NameCmp(protocol, internalNames[i]) == 0)
             return TRUE;
-    for (i = 0; miscNames[i]; i++)
+    for (i = 0; i < (sizeof(miscNames) / sizeof (miscNames[0])) - 1; i++)
         if (xf86NameCmp(protocol, miscNames[i]) == 0)
             return TRUE;
     return FALSE;