diff --git a/ath/if_ath_ahb.c b/ath/if_ath_ahb.c
index 12cfcfc..072cfa2 100644
--- a/ath/if_ath_ahb.c
+++ b/ath/if_ath_ahb.c
@@ -21,6 +21,7 @@
 #include <linux/cache.h>
 #include <linux/platform_device.h>
 #include <linux/ethtool.h>
+#include <linux/delay.h>
 
 #include <asm/io.h>
 #include <asm/uaccess.h>