diff --git a/linuxkm/Makefile b/linuxkm/Makefile
index 961f72416..bddda4795 100644
--- a/linuxkm/Makefile
+++ b/linuxkm/Makefile
@@ -33,8 +33,8 @@ ifndef SRC_TOP
 endif
 
 WOLFSSL_CFLAGS=-DHAVE_CONFIG_H -I$(SRC_TOP) -DBUILDING_WOLFSSL $(AM_CFLAGS) $(CFLAGS) -Wno-declaration-after-statement -Wno-redundant-decls
-ifdef KERNEL_OPT
-    WOLFSSL_CFLAGS += $(KERNEL_OPT)
+ifdef KERNEL_EXTRA_CFLAGS
+    WOLFSSL_CFLAGS += $(KERNEL_EXTRA_CFLAGS)
 endif
 
 WOLFSSL_ASFLAGS=-DHAVE_CONFIG_H -I$(SRC_TOP) -DBUILDING_WOLFSSL $(AM_CCASFLAGS) $(CCASFLAGS)