diff --git a/openbsc/tests/bsc-nat/bsc_nat_test.c b/openbsc/tests/bsc-nat/bsc_nat_test.c
index e39ec0c..6771b31 100644
--- a/openbsc/tests/bsc-nat/bsc_nat_test.c
+++ b/openbsc/tests/bsc-nat/bsc_nat_test.c
@@ -132,7 +132,7 @@
 
 struct filter_result {
 	const uint8_t *data;
-	const u_int16_t length;
+	const uint16_t length;
 	const int dir;
 	const int result;
 };