diff --git a/tests/net/arp/src/main.c b/tests/net/arp/src/main.c
index 088e380d32d..8c43d8a7ae4 100644
--- a/tests/net/arp/src/main.c
+++ b/tests/net/arp/src/main.c
@@ -14,11 +14,9 @@
 #include <stdint.h>
 #include <stddef.h>
 #include <string.h>
-#include <stdio.h>
 #include <errno.h>
 #include <device.h>
 #include <init.h>
-#include <misc/printk.h>
 #include <net/net_core.h>
 #include <net/nbuf.h>
 #include <net/net_ip.h>
@@ -107,7 +105,7 @@ static int tester_send(struct net_if *iface, struct net_buf *buf)
 			if (!req_test && memcmp(&hdr->dst, &hwaddr,
 						sizeof(struct net_eth_addr))) {
 				char out[sizeof("xx:xx:xx:xx:xx:xx")];
-				snprintf(out, sizeof(out),
+				snprintk(out, sizeof(out), "%s",
 					 net_sprint_ll_addr(
 						 (uint8_t *)&hdr->dst,
 						 sizeof(struct net_eth_addr)));
@@ -124,7 +122,7 @@ static int tester_send(struct net_if *iface, struct net_buf *buf)
 			if (memcmp(&hdr->src, &hwaddr,
 				   sizeof(struct net_eth_addr))) {
 				char out[sizeof("xx:xx:xx:xx:xx:xx")];
-				snprintf(out, sizeof(out),
+				snprintk(out, sizeof(out), "%s",
 					 net_sprint_ll_addr(
 						 (uint8_t *)&hdr->src,
 						 sizeof(struct net_eth_addr)));
@@ -464,7 +462,7 @@ static bool run_tests(void)
 	if (!net_ipv4_addr_cmp(&arp_hdr->dst_ipaddr,
 			       &NET_IPV4_BUF(buf)->dst)) {
 		char out[sizeof("xxx.xxx.xxx.xxx")];
-		snprintf(out, sizeof(out),
+		snprintk(out, sizeof(out), "%s",
 			 net_sprint_ipv4_addr(&arp_hdr->dst_ipaddr));
 		printk("ARP IP dest invalid %s, should be %s", out,
 		       net_sprint_ipv4_addr(&NET_IPV4_BUF(buf)->dst));
@@ -474,7 +472,7 @@ static bool run_tests(void)
 	if (!net_ipv4_addr_cmp(&arp_hdr->src_ipaddr,
 			       &NET_IPV4_BUF(buf)->src)) {
 		char out[sizeof("xxx.xxx.xxx.xxx")];
-		snprintf(out, sizeof(out),
+		snprintk(out, sizeof(out), "%s",
 			 net_sprint_ipv4_addr(&arp_hdr->src_ipaddr));
 		printk("ARP IP src invalid %s, should be %s", out,
 		       net_sprint_ipv4_addr(&NET_IPV4_BUF(buf)->src));
@@ -510,7 +508,7 @@ static bool run_tests(void)
 
 	if (!net_ipv4_addr_cmp(&arp_hdr->dst_ipaddr, &iface->ipv4.gw)) {
 		char out[sizeof("xxx.xxx.xxx.xxx")];
-		snprintf(out, sizeof(out),
+		snprintk(out, sizeof(out), "%s",
 			 net_sprint_ipv4_addr(&arp_hdr->dst_ipaddr));
 		printk("ARP IP dst invalid %s, should be %s\n", out,
 			 net_sprint_ipv4_addr(&iface->ipv4.gw));
diff --git a/tests/net/ip-addr/src/main.c b/tests/net/ip-addr/src/main.c
index 13a36f20eff..439b87064dc 100644
--- a/tests/net/ip-addr/src/main.c
+++ b/tests/net/ip-addr/src/main.c
@@ -9,11 +9,9 @@
 #include <stdint.h>
 #include <stddef.h>
 #include <string.h>
-#include <stdio.h>
 #include <errno.h>
 #include <device.h>
 #include <init.h>
-#include <misc/printk.h>
 #include <sections.h>
 
 #include <tc_util.h>
@@ -70,10 +68,11 @@
 		uint8_t ll1[] = { a, b, c, d, e, f };			\
 		uint8_t ll2[] = { f, e, d, c, b, a };			\
 		char out[2 * sizeof("xx:xx:xx:xx:xx:xx") + 1 + 1];	\
-		sprintf(out, "%s ",					\
-			net_sprint_ll_addr(ll1, sizeof(ll1)));		\
-		sprintf(out + sizeof("xx:xx:xx:xx:xx:xx"), "%s",	\
-			net_sprint_ll_addr(ll2, sizeof(ll2)));		\
+		snprintk(out, sizeof(out), "%s ",			\
+			 net_sprint_ll_addr(ll1, sizeof(ll1)));		\
+		snprintk(out + sizeof("xx:xx:xx:xx:xx:xx"),		\
+			 sizeof(out), "%s",				\
+			 net_sprint_ll_addr(ll2, sizeof(ll2)));		\
 		if (strcmp(out, expected)) {				\
 			printk("Test %s failed, got %s\n", expected, out); \
 			return false;					\
diff --git a/tests/net/nbuf/src/main.c b/tests/net/nbuf/src/main.c
index f46a1579a76..0291e59b299 100644
--- a/tests/net/nbuf/src/main.c
+++ b/tests/net/nbuf/src/main.c
@@ -11,7 +11,6 @@
 #include <string.h>
 #include <errno.h>
 #include <misc/printk.h>
-#include <stdio.h>
 
 #include <tc_util.h>
 
@@ -285,23 +284,23 @@ static void hexdump(const char *str, const uint8_t *packet, size_t length)
 
 	while (length--) {
 		if (n % 16 == 0) {
-			printf("%s %08X ", str, n);
+			printk("%s %08X ", str, n);
 		}
 
-		printf("%02X ", *packet++);
+		printk("%02X ", *packet++);
 
 		n++;
 		if (n % 8 == 0) {
 			if (n % 16 == 0) {
-				printf("\n");
+				printk("\n");
 			} else {
-				printf(" ");
+				printk(" ");
 			}
 		}
 	}
 
 	if (n % 16) {
-		printf("\n");
+		printk("\n");
 	}
 }