diff --git a/recipes-ccsp/hal/hal-ethsw-generic_git.bbappend b/recipes-ccsp/hal/hal-ethsw-generic_git.bbappend
index c50feee..4f9c9ed 100644
--- a/recipes-ccsp/hal/hal-ethsw-generic_git.bbappend
+++ b/recipes-ccsp/hal/hal-ethsw-generic_git.bbappend
@@ -4,6 +4,8 @@
 
 CFLAGS_append = "${@bb.utils.contains('DISTRO_FEATURES', 'rdkb_wan_manager', ' -DFEATURE_RDKB_WAN_MANAGER ', '', d)}"
 
+CFLAGS_append_mt7988 = " -DTHREE_GMACS_SUPPORT" 
+
 do_configure_prepend(){
    if ${@bb.utils.contains('DISTRO_FEATURES','switch_gsw_mode','true','false',d)}; then
    ln -sf ${S}/rdkb_hal/src/ethsw/ccsp_hal_ethsw_gsw.c ${S}/ccsp_hal_ethsw.c