diff --git a/openbsc/tests/bsc-nat/bsc_nat_test.c b/openbsc/tests/bsc-nat/bsc_nat_test.c
index b830eb0..a4b313c 100644
--- a/openbsc/tests/bsc-nat/bsc_nat_test.c
+++ b/openbsc/tests/bsc-nat/bsc_nat_test.c
@@ -645,7 +645,7 @@
 		}
 
 		if (msgb_l2len(output) != strlen(patc)) {
-			printf("Wrong sizes for test: %d  %d != %d != %d\n", i, msgb_l2len(output), strlen(patc), strlen(orig));
+			printf("Wrong sizes for test: %d  %u != %zu != %zu\n", i, msgb_l2len(output), strlen(patc), strlen(orig));
 			printf("String '%s' vs '%s'\n", (const char *) output->l2h, patc);
 			abort();
 		}
diff --git a/openbsc/tests/gbproxy/gbproxy_test.c b/openbsc/tests/gbproxy/gbproxy_test.c
index 214d477..17f0a17 100644
--- a/openbsc/tests/gbproxy/gbproxy_test.c
+++ b/openbsc/tests/gbproxy/gbproxy_test.c
@@ -956,7 +956,7 @@
 int gprs_ns_callback(enum gprs_ns_evt event, struct gprs_nsvc *nsvc,
 			 struct msgb *msg, uint16_t bvci)
 {
-	printf("CALLBACK, event %d, msg length %d, bvci 0x%04x\n%s\n\n",
+	printf("CALLBACK, event %d, msg length %zu, bvci 0x%04x\n%s\n\n",
 			event, msgb_bssgp_len(msg), bvci,
 			osmo_hexdump(msgb_l2(msg), msgb_l2len(msg)));
 
diff --git a/openbsc/tests/gsm0408/gsm0408_test.c b/openbsc/tests/gsm0408/gsm0408_test.c
index 692ec90..781ef61 100644
--- a/openbsc/tests/gsm0408/gsm0408_test.c
+++ b/openbsc/tests/gsm0408/gsm0408_test.c
@@ -48,7 +48,7 @@
 #define VERIFY(res, cmp, wanted)					\
 	if (!(res cmp wanted)) {					\
 		printf("ASSERT failed: %s:%d Wanted: %d %s %d\n",	\
-			__FILE__, __LINE__, res, # cmp, wanted);	\
+			__FILE__, __LINE__, (int) res, # cmp, (int) wanted);	\
 	}