diff --git a/sysfile.c b/sysfile.c
index 2209f6e..aaeccc5 100644
--- a/sysfile.c
+++ b/sysfile.c
@@ -54,7 +54,7 @@ sys_dup(void)
 {
   struct file *f;
   int fd;
-  
+
   if(argfd(0, 0, &f) < 0)
     return -1;
   if((fd=fdalloc(f)) < 0)
@@ -92,7 +92,7 @@ sys_close(void)
 {
   int fd;
   struct file *f;
-  
+
   if(argfd(0, &fd, &f) < 0)
     return -1;
   proc->ofile[fd] = 0;
@@ -105,7 +105,7 @@ sys_fstat(void)
 {
   struct file *f;
   struct stat *st;
-  
+
   if(argfd(0, 0, &f) < 0 || argptr(1, (void*)&st, sizeof(*st)) < 0)
     return -1;
   return filestat(f, st);
@@ -351,11 +351,10 @@ sys_mknod(void)
 {
   struct inode *ip;
   char *path;
-  int len;
   int major, minor;
-  
+
   begin_op();
-  if((len=argstr(0, &path)) < 0 ||
+  if((argstr(0, &path)) < 0 ||
      argint(1, &major) < 0 ||
      argint(2, &minor) < 0 ||
      (ip = create(path, T_DEV, major, minor)) == 0){