--- a/kernel/zaptel-base.c
+++ b/kernel/zaptel-base.c
@@ -5182,14 +5182,20 @@ static int zt_ioctl(struct inode *inode,
 }
 
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36)
+#ifdef CONFIG_BKL
 #include <linux/smp_lock.h>
+#endif
 static long zt_ioctl_unlocked(struct file *file, unsigned int cmd, unsigned long data)
 {
 	int ret;
 
+#ifdef CONFIG_BKL
 	lock_kernel();
+#endif
 	ret = zt_ioctl(file->f_path.dentry->d_inode, file, cmd, data);
+#ifdef CONFIG_BKL
 	unlock_kernel();
+#endif
 
 	return ret;
 }