diff --git a/target/linux/ar71xx/files/arch/mips/include/asm/mach-ar71xx/ar71xx.h b/target/linux/ar71xx/files/arch/mips/include/asm/mach-ar71xx/ar71xx.h
index 791dd6d87..a0232d689 100644
--- a/target/linux/ar71xx/files/arch/mips/include/asm/mach-ar71xx/ar71xx.h
+++ b/target/linux/ar71xx/files/arch/mips/include/asm/mach-ar71xx/ar71xx.h
@@ -71,7 +71,7 @@
 #define AR91XX_WMAC_SIZE	0x30000
 
 #define AR934X_WMAC_BASE	(AR71XX_APB_BASE + 0x00100000)
-#define AR934X_WMAC_SIZE	0x1ffff
+#define AR934X_WMAC_SIZE	0x20000
 
 #define AR71XX_MEM_SIZE_MIN	0x0200000
 #define AR71XX_MEM_SIZE_MAX	0x10000000