--- a/m4/kernelversion.m4
+++ b/m4/kernelversion.m4
@@ -1,7 +1,7 @@
 dnl AX_KERNEL_VERSION(major, minor, level, comparison, action-if-true, action-if-false)
 AC_DEFUN([AX_KERNEL_VERSION], [
 SAVE_CFLAGS=$CFLAGS
-CFLAGS="-I$KINC -D__KERNEL__ -Werror"
+CFLAGS="-I$KINC -Werror"
 AC_TRY_COMPILE( 
   [
   #include <linux/version.h>