diff --git a/sys/mips/atheros/ar91xxreg.h b/sys/mips/atheros/ar91xxreg.h
index 8fecddff071f..729d9ffcf7d0 100644
--- a/sys/mips/atheros/ar91xxreg.h
+++ b/sys/mips/atheros/ar91xxreg.h
@@ -35,6 +35,7 @@
 #define	AR91XX_RESET_REG_RESET_MODULE	AR71XX_RST_BLOCK_BASE + 0x1c
 
 #define	AR91XX_RST_RESET_MODULE_USBSUS_OVERRIDE	(1 << 10)
+#define	AR91XX_RST_RESET_MODULE_AMBA2WMAC	(1 << 22)
 
 /* PLL block */
 #define	AR91XX_PLL_REG_CPU_CONFIG       AR71XX_PLL_CPU_BASE + 0x00