diff --git a/Kbuild b/Kbuild
index 1de5ab7f72f7..e02e75160797 100644
--- a/Kbuild
+++ b/Kbuild
@@ -2474,7 +2474,8 @@ CMN_IDS = $(shell cd "$(WLAN_COMMON_INC)" && \
 
 TIMESTAMP = $(shell date -u +'%Y-%m-%dT%H:%M:%SZ')
 BUILD_TAG = "$(TIMESTAMP); cld:$(CLD_IDS); cmn:$(CMN_IDS);"
-CDEFINES += -DBUILD_TAG=\"$(BUILD_TAG)\"
+# It's assumed that BUILD_TAG is used only in wlan_hdd_main.c
+CFLAGS_wlan_hdd_main.o += -DBUILD_TAG=\"$(BUILD_TAG)\"
 endif
 
 # Module information used by KBuild framework