diff --git a/Kbuild b/Kbuild
index 0fa71dc..d37e7ea 100644
--- a/Kbuild
+++ b/Kbuild
@@ -2348,6 +2348,10 @@
 cppflags-$(CONFIG_QCA_IBSS_SUPPORT) += -DQCA_IBSS_SUPPORT
 endif
 
+ifeq ($(CONFIG_DFS_FCC_TYPE4_DURATION_CHECK), y)
+cppflags-$(CONFIG_DFS_FCC_TYPE4_DURATION_CHECK) += -DDFS_FCC_TYPE4_DURATION_CHECK
+endif
+
 cppflags-$(CONFIG_WLAN_SYSFS) += -DWLAN_SYSFS
 cppflags-$(CONFIG_FEATURE_WLAN_RMC) += -DFEATURE_WLAN_RMC
 cppflags-$(CONFIG_FEATURE_BECN_STATS) += -DWLAN_FEATURE_BEACON_RECEPTION_STATS