diff --git a/openair2/RRC/LITE/MESSAGES/Makefile b/openair2/RRC/LITE/MESSAGES/Makefile
index 16a5170e30..09161af125 100644
--- a/openair2/RRC/LITE/MESSAGES/Makefile
+++ b/openair2/RRC/LITE/MESSAGES/Makefile
@@ -9,11 +9,8 @@ ifdef RTAI
 CCC = $(shell rtai-config --cc)
 RTAI_SUBVERSION=$(shell rtai-config --version | sed -e 's/^..\(.\).*$$/\1/')
 IS_RTAI_SUBVERSION_LESS_THAN_FIVE=$(shell if [ $(RTAI_SUBVERSION) -lt 5 ] ; then echo true ; fi)
-SUBVERSION=$(shell echo `grep '^SUBLEVEL =' /usr/src/linux/Makefile | sed -e 's, ,,g' | sed -e 's/SUBLEVEL=//'`)
-IS_KERNEL_SUBVERSION_GREATER_THAN_20=$(shell if [ $(SUBVERSION) -ge 20 ] ; then echo true ; fi)
 
-
-EXTRA_CFLAGS += -D__IN_RTAI__ $(shell rtai-config --module-cflags) -g -march=pentium4 -DNODE_RG -DBIGPHYSAREA -DRTAI -DRTAI_ENABLED $(if $(IS_KERNEL_SUBVERSION_GREATER_THAN_20),-mregparm=3 -fno-stack-protector,) -DHW_PREFIX_REMOVAL -Wall -D__KERNEL__ -DMODULE -D_LOOSE_KERNEL_NAMES -DWIDENS_DLC -I/lib/modules/$(shell uname -r)/build/include -I/lib/modules/$(shell uname -r)/build/include/asm/mach-default -include /lib/modules/$(shell uname -r)/build/include/linux/autoconf.h $(if $(IS_RTAI_SUBVERSION_LESS_THAN_FIVE),-DRTAI_ISNT_POSIX,)
+EXTRA_CFLAGS += -D__IN_RTAI__ $(shell rtai-config --module-cflags) -g -march=pentium4 -DNODE_RG -DBIGPHYSAREA -DRTAI -DRTAI_ENABLED -mregparm=3 -fno-stack-protector -DHW_PREFIX_REMOVAL -Wall -D__KERNEL__ -DMODULE -D_LOOSE_KERNEL_NAMES -DWIDENS_DLC -I/lib/modules/$(shell uname -r)/build/include -I/lib/modules/$(shell uname -r)/build/include/asm/mach-default -include /lib/modules/$(shell uname -r)/build/include/linux/autoconf.h $(if $(IS_RTAI_SUBVERSION_LESS_THAN_FIVE),-DRTAI_ISNT_POSIX,)
 endif