diff --git a/Kbuild b/Kbuild
index f113518c8fa2..137b91cf1ec6 100644
--- a/Kbuild
+++ b/Kbuild
@@ -2808,6 +2808,8 @@ ccflags-$(CONFIG_HASTINGS_BT_WAR) += -DHASTINGS_BT_WAR
 
 cppflags-$(CONFIG_SLUB_DEBUG_ON) += -DHIF_CONFIG_SLUB_DEBUG_ON
 
+ccflags-$(CONFIG_FOURTH_CONNECTION) += -DFEATURE_FOURTH_CONNECTION
+
 KBUILD_CPPFLAGS += $(cppflags-y)
 
 # Currently, for versions of gcc which support it, the kernel Makefile
diff --git a/configs/qca6390_defconfig b/configs/qca6390_defconfig
index 2db953f68a41..1edfac5cb9dc 100644
--- a/configs/qca6390_defconfig
+++ b/configs/qca6390_defconfig
@@ -723,3 +723,5 @@ endif
 ifeq (y,$(findstring y,$(CONFIG_ARCH_MSM) $(CONFIG_ARCH_QCOM)))
 CONFIG_WLAN_FEATURE_DP_BUS_BANDWIDTH := y
 endif
+
+CONFIG_FOURTH_CONNECTION := y