diff --git a/Makefile b/Makefile
index 529343d..29eef99 100644
--- a/Makefile
+++ b/Makefile
@@ -52,6 +52,9 @@ CPPFLAGS += \
 	-DPF_CAN=29 \
 	-DSO_RXQ_OVFL=40 \
 	-DSCM_TIMESTAMPING_OPT_STATS=54 \
+	-DCLOCK_TAI=11 \
+	-DSO_TXTIME=61 \
+	-DSCM_TXTIME=SO_TXTIME \
 	-D_FILE_OFFSET_BITS=64 \
 	-D_GNU_SOURCE