diff --git a/tests/lwip_sock_tcp/main.c b/tests/lwip_sock_tcp/main.c
index f4fa462fa54a778ada43fe9483eda301978b6e44..5b98ce214283daf101ead2ec4c50b01ed42b3388 100644
--- a/tests/lwip_sock_tcp/main.c
+++ b/tests/lwip_sock_tcp/main.c
@@ -88,7 +88,7 @@ static void tear_down(void)
 #ifdef SO_REUSE
 static void test_tcp_connect4__EADDRINUSE(void)
 {
-    const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
+    static const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                           .family = AF_INET,
                                           .port = _TEST_PORT_REMOTE,
                                           .netif = SOCK_ADDR_ANY_NETIF };
@@ -107,7 +107,7 @@ static void test_tcp_connect4__EADDRINUSE(void)
 
 static void test_tcp_connect4__EAFNOSUPPORT(void)
 {
-    const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
+    static const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                           .port = _TEST_PORT_REMOTE,
                                           .netif = SOCK_ADDR_ANY_NETIF };
 
@@ -129,7 +129,7 @@ static void test_tcp_connect4__EINVAL_addr(void)
 
 static void test_tcp_connect4__EINVAL_netif(void)
 {
-    const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
+    static const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                           .family = AF_INET,
                                           .port = _TEST_PORT_REMOTE,
                                           .netif = (_TEST_NETIF + 1) };
@@ -142,7 +142,7 @@ static void test_tcp_connect4__EINVAL_netif(void)
 
 static void test_tcp_connect4__success_without_port(void)
 {
-    const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
+    static const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                           .family = AF_INET,
                                           .port = _TEST_PORT_REMOTE,
                                           .netif = _TEST_NETIF };
@@ -164,7 +164,7 @@ static void test_tcp_connect4__success_without_port(void)
 }
 static void test_tcp_connect4__success_local_port(void)
 {
-    const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
+    static const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                           .family = AF_INET,
                                           .port = _TEST_PORT_REMOTE,
                                           .netif = SOCK_ADDR_ANY_NETIF };
@@ -192,7 +192,7 @@ static void test_tcp_connect4__success_local_port(void)
 #ifdef SO_REUSE
 static void test_tcp_listen4__EADDRINUSE(void)
 {
-    const sock_tcp_ep_t local = { .addr = { .ipv4_u32 = _TEST_ADDR4_LOCAL },
+    static const sock_tcp_ep_t local = { .addr = { .ipv4_u32 = _TEST_ADDR4_LOCAL },
                                          .family = AF_INET,
                                          .port = _TEST_PORT_LOCAL,
                                          .netif = SOCK_ADDR_ANY_NETIF };
@@ -211,7 +211,7 @@ static void test_tcp_listen4__EADDRINUSE(void)
 
 static void test_tcp_listen4__EAFNOSUPPORT(void)
 {
-    const sock_tcp_ep_t local = { .addr = { .ipv4_u32 = _TEST_ADDR4_LOCAL },
+    static const sock_tcp_ep_t local = { .addr = { .ipv4_u32 = _TEST_ADDR4_LOCAL },
                                          .port = _TEST_PORT_LOCAL,
                                          .netif = SOCK_ADDR_ANY_NETIF };
 
@@ -221,7 +221,7 @@ static void test_tcp_listen4__EAFNOSUPPORT(void)
 
 static void test_tcp_listen4__EINVAL(void)
 {
-    const sock_tcp_ep_t local = { .addr = { .ipv4_u32 = _TEST_ADDR4_LOCAL },
+    static const sock_tcp_ep_t local = { .addr = { .ipv4_u32 = _TEST_ADDR4_LOCAL },
                                          .family = AF_INET,
                                          .port = _TEST_PORT_LOCAL,
                                          .netif = (_TEST_NETIF + 1) };
@@ -232,7 +232,7 @@ static void test_tcp_listen4__EINVAL(void)
 
 static void test_tcp_listen4__success_any_netif(void)
 {
-    const sock_tcp_ep_t local = { .addr = { .ipv4_u32 = _TEST_ADDR4_LOCAL },
+    static const sock_tcp_ep_t local = { .addr = { .ipv4_u32 = _TEST_ADDR4_LOCAL },
                                          .family = AF_INET,
                                          .port = _TEST_PORT_LOCAL,
                                          .netif = SOCK_ADDR_ANY_NETIF };
@@ -328,7 +328,7 @@ static void test_tcp_accept4__success(void)
 
 static void test_tcp_read4__EAGAIN(void)
 {
-    const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
+    static const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                           .family = AF_INET,
                                           .port = _TEST_PORT_REMOTE,
                                           .netif = SOCK_ADDR_ANY_NETIF };
@@ -348,7 +348,7 @@ static void test_tcp_read4__EAGAIN(void)
 
 static void test_tcp_read4__ECONNRESET(void)
 {
-    const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
+    static const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                           .family = AF_INET,
                                           .port = _TEST_PORT_REMOTE,
                                           .netif = SOCK_ADDR_ANY_NETIF };
@@ -378,7 +378,7 @@ static void test_tcp_read4__ENOTCONN(void)
 
 static void test_tcp_read4__ETIMEDOUT(void)
 {
-    const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
+    static const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                           .family = AF_INET,
                                           .port = _TEST_PORT_REMOTE,
                                           .netif = SOCK_ADDR_ANY_NETIF };
@@ -401,7 +401,7 @@ static void test_tcp_read4__ETIMEDOUT(void)
 
 static void test_tcp_read4__success(void)
 {
-    const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
+    static const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                           .family = AF_INET,
                                           .port = _TEST_PORT_REMOTE,
                                           .netif = SOCK_ADDR_ANY_NETIF };
@@ -429,7 +429,7 @@ static void test_tcp_read4__success(void)
 
 static void test_tcp_read4__success_with_timeout(void)
 {
-    const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
+    static const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                           .family = AF_INET,
                                           .port = _TEST_PORT_REMOTE,
                                           .netif = SOCK_ADDR_ANY_NETIF };
@@ -457,7 +457,7 @@ static void test_tcp_read4__success_with_timeout(void)
 
 static void test_tcp_read4__success_non_blocking(void)
 {
-    const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
+    static const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                           .family = AF_INET,
                                           .port = _TEST_PORT_REMOTE,
                                           .netif = SOCK_ADDR_ANY_NETIF };
@@ -492,7 +492,7 @@ static void test_tcp_write4__ENOTCONN(void)
 
 static void test_tcp_write4__success(void)
 {
-    const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
+    static const sock_tcp_ep_t remote = { .addr = { .ipv4_u32 = _TEST_ADDR4_REMOTE },
                                           .family = AF_INET,
                                           .port = _TEST_PORT_REMOTE,
                                           .netif = SOCK_ADDR_ANY_NETIF };