diff --git a/target/linux/ar71xx/files/include/linux/ath9k_platform.h b/target/linux/ar71xx/files/include/linux/ath9k_platform.h
index 020387a11..60a7c49dc 100644
--- a/target/linux/ar71xx/files/include/linux/ath9k_platform.h
+++ b/target/linux/ar71xx/files/include/linux/ath9k_platform.h
@@ -28,6 +28,8 @@ struct ath9k_platform_data {
 	int led_pin;
 	u32 gpio_mask;
 	u32 gpio_val;
+
+	bool is_clk_25mhz;
 };
 
 #endif /* _LINUX_ATH9K_PLATFORM_H */