diff --git a/target/linux/ar71xx/files/arch/mips/ath79/dev-eth.c b/target/linux/ar71xx/files/arch/mips/ath79/dev-eth.c
index 8b54d0c817..da67478fe6 100644
--- a/target/linux/ar71xx/files/arch/mips/ath79/dev-eth.c
+++ b/target/linux/ar71xx/files/arch/mips/ath79/dev-eth.c
@@ -20,6 +20,7 @@
 #include <linux/platform_device.h>
 #include <linux/serial_8250.h>
 #include <linux/clk.h>
+#include <linux/sizes.h>
 
 #include <asm/mach-ath79/ath79.h>
 #include <asm/mach-ath79/ar71xx_regs.h>
@@ -958,6 +959,9 @@ void __init ath79_register_eth(unsigned int id)
 		pdata->has_gbit = 1;
 		pdata->is_ar724x = 1;
 
+		pdata->max_frame_len = SZ_16K - 1;
+		pdata->desc_pktlen_mask = SZ_16K - 1;
+
 		if (!pdata->fifo_cfg1)
 			pdata->fifo_cfg1 = 0x0010ffff;
 		if (!pdata->fifo_cfg2)