diff --git a/drivers/net/wireless/bcm43xx/bcm43xx_debugfs.c b/drivers/net/wireless/bcm43xx/bcm43xx_debugfs.c
index 35dbe455451306886ee42670648184046416c7f4..76e9dd843faacd23346307774ab974870f38161e 100644
--- a/drivers/net/wireless/bcm43xx/bcm43xx_debugfs.c
+++ b/drivers/net/wireless/bcm43xx/bcm43xx_debugfs.c
@@ -219,7 +219,7 @@ static ssize_t tsf_write_file(struct file *file, const char __user *user_buf,
 	ssize_t buf_size;
 	ssize_t res;
 	unsigned long flags;
-	u64 tsf;
+	unsigned long long tsf;
 
 	buf_size = min(count, sizeof (really_big_buffer) - 1);
 	down(&big_buffer_sem);