diff --git a/tools/testing/selftests/ptp/Makefile b/tools/testing/selftests/ptp/Makefile
index 83dd42b2129e92806138cf653372792effb9ce8a..d4064c742c2673424b0fbac81afde676fa24f4d0 100644
--- a/tools/testing/selftests/ptp/Makefile
+++ b/tools/testing/selftests/ptp/Makefile
@@ -1,3 +1,4 @@
+CFLAGS += -I../../../../usr/include/
 TEST_PROGS := testptp
 LDLIBS += -lrt
 all: $(TEST_PROGS)