diff --git a/tests/gb/gprs_bssgp_test.c b/tests/gb/gprs_bssgp_test.c
index 14ba4d1..707b64b 100644
--- a/tests/gb/gprs_bssgp_test.c
+++ b/tests/gb/gprs_bssgp_test.c
@@ -45,7 +45,7 @@
 	if (!real_sendto)
 		real_sendto = dlsym(RTLD_NEXT, "sendto");
 
-	fprintf(stderr, "MESSAGE to 0x%08x, msg length %d\n%s\n",
+	fprintf(stderr, "MESSAGE to 0x%08x, msg length %zu\n%s\n",
 		dest_host, len, osmo_hexdump(buf, len));
 
 	return len;
@@ -55,7 +55,7 @@
 int gprs_ns_callback(enum gprs_ns_evt event, struct gprs_nsvc *nsvc,
 			 struct msgb *msg, uint16_t bvci)
 {
-	fprintf(stderr, "CALLBACK, event %d, msg length %d, bvci 0x%04x\n%s\n\n",
+	fprintf(stderr, "CALLBACK, event %d, msg length %td, bvci 0x%04x\n%s\n\n",
 			event, msgb_bssgp_len(msg), bvci,
 			osmo_hexdump(msgb_bssgph(msg), msgb_bssgp_len(msg)));
 	return 0;
diff --git a/tests/gb/gprs_ns_test.c b/tests/gb/gprs_ns_test.c
index a742130..4c6fd39 100644
--- a/tests/gb/gprs_ns_test.c
+++ b/tests/gb/gprs_ns_test.c
@@ -249,7 +249,7 @@
 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 %td, bvci 0x%04x\n%s\n\n",
 			event, msgb_bssgp_len(msg), bvci,
 			osmo_hexdump(msgb_bssgph(msg), msgb_bssgp_len(msg)));
 	return 0;
@@ -270,9 +270,9 @@
 	sent_pdu_type = len > 0 ? ((uint8_t *)buf)[0] : -1;
 
 	if (dest_host == REMOTE_BSS_ADDR)
-		printf("MESSAGE to BSS, msg length %d\n%s\n\n", len, osmo_hexdump(buf, len));
+		printf("MESSAGE to BSS, msg length %zu\n%s\n\n", len, osmo_hexdump(buf, len));
 	else if (dest_host == REMOTE_SGSN_ADDR)
-		printf("MESSAGE to SGSN, msg length %d\n%s\n\n", len, osmo_hexdump(buf, len));
+		printf("MESSAGE to SGSN, msg length %zu\n%s\n\n", len, osmo_hexdump(buf, len));
 	else
 		return real_sendto(sockfd, buf, len, flags, dest_addr, addrlen);
 
@@ -294,10 +294,10 @@
 		real_gprs_ns_sendmsg = dlsym(RTLD_NEXT, "gprs_ns_sendmsg");
 
 	if (nsei == SGSN_NSEI)
-		printf("NS UNITDATA MESSAGE to SGSN, BVCI 0x%04x, msg length %d\n%s\n\n",
+		printf("NS UNITDATA MESSAGE to SGSN, BVCI 0x%04x, msg length %zu\n%s\n\n",
 		       bvci, len, osmo_hexdump(buf, len));
 	else
-		printf("NS UNITDATA MESSAGE to BSS, BVCI 0x%04x, msg length %d\n%s\n\n",
+		printf("NS UNITDATA MESSAGE to BSS, BVCI 0x%04x, msg length %zu\n%s\n\n",
 		       bvci, len, osmo_hexdump(buf, len));
 
 	return real_gprs_ns_sendmsg(nsi, msg);
@@ -382,7 +382,7 @@
 	struct msgb *msg;
 	int ret;
 	if (data_len > NS_ALLOC_SIZE - NS_ALLOC_HEADROOM) {
-		fprintf(stderr, "message too long: %d\n", data_len);
+		fprintf(stderr, "message too long: %zu\n", data_len);
 		return -1;
 	}
 
@@ -411,7 +411,7 @@
 	struct msgb *msg;
 	int ret;
 	if (data_len > NS_ALLOC_SIZE - NS_ALLOC_HEADROOM) {
-		fprintf(stderr, "message too long: %d\n", data_len);
+		fprintf(stderr, "message too long: %zu\n", data_len);
 		return -1;
 	}
 
diff --git a/tests/gsm0808/gsm0808_test.c b/tests/gsm0808/gsm0808_test.c
index 7e5e97b..98502b7 100644
--- a/tests/gsm0808/gsm0808_test.c
+++ b/tests/gsm0808/gsm0808_test.c
@@ -26,7 +26,7 @@
 #define VERIFY(msg, data, len) 						\
 	if (msgb_l3len(msg) != len) {					\
 		printf("%s:%d Length don't match: %d vs. %d. %s\n", 	\
-			__func__, __LINE__, msgb_l3len(msg), len,	\
+			__func__, __LINE__, msgb_l3len(msg), (int) len,	\
 			osmo_hexdump(msg->l3h, msgb_l3len(msg))); 	\
 		abort();						\
 	} else if (memcmp(msg->l3h, data, len) != 0) {			\
diff --git a/tests/msgb/msgb_test.c b/tests/msgb/msgb_test.c
index 8839a2e..a726ef4 100644
--- a/tests/msgb/msgb_test.c
+++ b/tests/msgb/msgb_test.c
@@ -76,24 +76,24 @@
 	printf("Buffer: %s\n", msgb_hexdump(msg));
 	OSMO_ASSERT(msgb_test_invariant(msg));
 	cptr = msg->l1h = msgb_put(msg, 4);
-	printf("put(4) -> data%+d\n", cptr - msg->data);
+	printf("put(4) -> data%+td\n", cptr - msg->data);
 	printf("Buffer: %s\n", msgb_hexdump(msg));
 	OSMO_ASSERT(msgb_test_invariant(msg));
 	cptr = msg->l2h = msgb_put(msg, 4);
-	printf("put(4) -> data%+d\n", cptr - msg->data);
+	printf("put(4) -> data%+td\n", cptr - msg->data);
 	printf("Buffer: %s\n", msgb_hexdump(msg));
 	OSMO_ASSERT(msgb_test_invariant(msg));
 	cptr = msg->l3h = msgb_put(msg, 4);
-	printf("put(4) -> data%+d\n", cptr - msg->data);
+	printf("put(4) -> data%+td\n", cptr - msg->data);
 	printf("Buffer: %s\n", msgb_hexdump(msg));
 	OSMO_ASSERT(msgb_test_invariant(msg));
 	cptr = msg->l4h = msgb_put(msg, 4);
-	printf("put(4) -> data%+d\n", cptr - msg->data);
+	printf("put(4) -> data%+td\n", cptr - msg->data);
 	printf("Buffer: %s\n", msgb_hexdump(msg));
 	OSMO_ASSERT(msgb_test_invariant(msg));
 	OSMO_ASSERT(msgb_length(msg) == 16);
 	cptr = msgb_push(msg, 4);
-	printf("push(4) -> data%+d\n", cptr - msg->data);
+	printf("push(4) -> data%+td\n", cptr - msg->data);
 	printf("Buffer: %s\n", msgb_hexdump(msg));
 	OSMO_ASSERT(msgb_test_invariant(msg));
 	OSMO_ASSERT(msgb_length(msg) == 20);
@@ -105,7 +105,7 @@
 	OSMO_ASSERT(msgb_length(msg) == 16);
 
 	cptr = msgb_get(msg, 4);
-	printf("get(4) -> data%+d\n", cptr - msg->data);
+	printf("get(4) -> data%+td\n", cptr - msg->data);
 	printf("Buffer: %s\n", msgb_hexdump(msg));
 	OSMO_ASSERT(msgb_test_invariant(msg));
 	OSMO_ASSERT(msgb_length(msg) == 12);
diff --git a/tests/sms/sms_test.c b/tests/sms/sms_test.c
index cdd4158..776c45a 100644
--- a/tests/sms/sms_test.c
+++ b/tests/sms/sms_test.c
@@ -390,7 +390,7 @@
 		memset(result, 0x42, sizeof(result));
 		nchars = gsm_7bit_decode_n_hdr(result, sizeof(result), test_decode[i].input,
 				test_decode[i].expected_septet_length, test_decode[i].ud_hdr_ind);
-		printf("Decode case %d: return value %d (expected %d)\n", i, nchars, strlen(result));
+		printf("Decode case %d: return value %d (expected %zu)\n", i, nchars, strlen(result));
 
 		OSMO_ASSERT(strcmp(result, (const char *) test_decode[i].expected) == 0);
 		OSMO_ASSERT(nchars == strlen(result));
diff --git a/tests/smscb/gsm0341_test.c b/tests/smscb/gsm0341_test.c
index a8e32d4..c400f5c 100644
--- a/tests/smscb/gsm0341_test.c
+++ b/tests/smscb/gsm0341_test.c
@@ -21,6 +21,7 @@
 #include <string.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <time.h>
 
 #include <osmocom/gsm/protocol/gsm_03_41.h>
 #include <osmocom/gsm/gsm0341.h>