diff --git a/examples/dtls-echo/dtls-client.c b/examples/dtls-echo/dtls-client.c
index c1563252cb..fd4e4b60ff 100644
--- a/examples/dtls-echo/dtls-client.c
+++ b/examples/dtls-echo/dtls-client.c
@@ -114,7 +114,7 @@ static int dtls_handle_read(dtls_context_t *ctx)
 
     if (res <= 0) {
         if ((ENABLE_DEBUG) && (res != -EAGAIN) && (res != -ETIMEDOUT)) {
-            DEBUG("sock_udp_recv unexpected code error: %i\n", (int)res);
+            DEBUG("sock_udp_recv unexpected code error: %" PRIiSIZE "\n", res);
         }
         return 0;
     }
diff --git a/examples/dtls-echo/dtls-server.c b/examples/dtls-echo/dtls-server.c
index 4abdf833cf..18f5f206d4 100644
--- a/examples/dtls-echo/dtls-server.c
+++ b/examples/dtls-echo/dtls-server.c
@@ -106,7 +106,7 @@ static int dtls_handle_read(dtls_context_t *ctx)
 
     if (res <= 0) {
         if ((ENABLE_DEBUG) && (res != -EAGAIN) && (res != -ETIMEDOUT)) {
-            DEBUG("sock_udp_recv unexpected code error: %i\n", (int)res);
+            DEBUG("sock_udp_recv unexpected code error: %" PRIiSIZE "\n", res);
         }
         return 0;
     }
diff --git a/examples/dtls-sock/dtls-client.c b/examples/dtls-sock/dtls-client.c
index 71560c22b4..4a913cee95 100644
--- a/examples/dtls-sock/dtls-client.c
+++ b/examples/dtls-sock/dtls-client.c
@@ -154,7 +154,7 @@ static int client_send(char *addr_str, char *data, size_t datalen)
     res = credman_add(&credential0);
     if (res < 0 && res != CREDMAN_EXIST) {
         /* ignore duplicate credentials */
-        printf("Error cannot add credential to system: %d\n", (int)res);
+        printf("Error cannot add credential to system: %" PRIdSIZE "\n", res);
         return -1;
     }
 
@@ -170,13 +170,13 @@ static int client_send(char *addr_str, char *data, size_t datalen)
     res = credman_add(&credential1);
     if (res < 0 && res != CREDMAN_EXIST) {
         /* ignore duplicate credentials */
-        printf("Error cannot add credential to system: %d\n", (int)res);
+        printf("Error cannot add credential to system: %" PRIdSIZE "\n", res);
         return -1;
     }
 
     /* make the new credential available to the sock */
     if (sock_dtls_add_credential(&dtls_sock, SOCK_DTLS_CLIENT_TAG_1) < 0) {
-        printf("Error cannot add credential to the sock: %d\n", (int)res);
+        printf("Error cannot add credential to the sock: %" PRIdSIZE "\n", res);
         return -1;
     }
 
@@ -192,7 +192,7 @@ static int client_send(char *addr_str, char *data, size_t datalen)
     res = sock_dtls_recv(&dtls_sock, &session, buf, sizeof(buf),
                          SOCK_NO_TIMEOUT);
     if (res != -SOCK_DTLS_HANDSHAKE) {
-        printf("Error creating session: %d\n", (int)res);
+        printf("Error creating session: %" PRIdSIZE "\n", res);
         sock_dtls_close(&dtls_sock);
         sock_udp_close(&udp_sock);
         return -1;
@@ -208,7 +208,7 @@ static int client_send(char *addr_str, char *data, size_t datalen)
         uint8_t rcv[512];
         if ((res = sock_dtls_recv(&dtls_sock, &session, rcv, sizeof(rcv),
                                     SOCK_NO_TIMEOUT)) >= 0) {
-            printf("Received %d bytes: \"%.*s\"\n", (int)res, (int)res,
+            printf("Received %" PRIdSIZE " bytes: \"%.*s\"\n", res, (int)res,
                    (char *)rcv);
         }
     }
diff --git a/examples/dtls-sock/dtls-server.c b/examples/dtls-sock/dtls-server.c
index 5288388147..c31845ceb5 100644
--- a/examples/dtls-sock/dtls-server.c
+++ b/examples/dtls-sock/dtls-server.c
@@ -139,7 +139,7 @@ void *dtls_server_wrapper(void *arg)
     res = credman_add(&credential0);
     if (res < 0 && res != CREDMAN_EXIST) {
         /* ignore duplicate credentials */
-        printf("Error cannot add credential to system: %d\n", (int)res);
+        printf("Error cannot add credential to system: %" PRIdSIZE "\n", res);
         return NULL;
     }
 
@@ -163,13 +163,13 @@ void *dtls_server_wrapper(void *arg)
     res = credman_add(&credential1);
     if (res < 0 && res != CREDMAN_EXIST) {
         /* ignore duplicate credentials */
-        printf("Error cannot add credential to system: %d\n", (int)res);
+        printf("Error cannot add credential to system: %" PRIdSIZE "\n", res);
         return NULL;
     }
 
     /* make the new credential available to the sock */
     if (sock_dtls_add_credential(&sock, SOCK_DTLS_SERVER_TAG_1) < 0) {
-        printf("Error cannot add credential to the sock: %d\n", (int)res);
+        printf("Error cannot add credential to the sock: %" PRIdSIZE "\n", res);
         return NULL;
     }
 
@@ -187,10 +187,10 @@ void *dtls_server_wrapper(void *arg)
             res = sock_dtls_recv(&sock, &session, rcv, sizeof(rcv),
                                   10 * US_PER_SEC);
             if (res >= 0) {
-                printf("Received %d bytes -- (echo)\n", (int)res);
+                printf("Received %" PRIdSIZE " bytes -- (echo)\n", res);
                 res = sock_dtls_send(&sock, &session, rcv, (size_t)res, 0);
                 if (res < 0) {
-                    printf("Error resending DTLS message: %d", (int)res);
+                    printf("Error resending DTLS message: %" PRIdSIZE, res);
                 }
                 sock_dtls_session_destroy(&sock, &session);
             }
diff --git a/examples/emcute_mqttsn/main.c b/examples/emcute_mqttsn/main.c
index 34c175498d..0530b88d4e 100644
--- a/examples/emcute_mqttsn/main.c
+++ b/examples/emcute_mqttsn/main.c
@@ -159,8 +159,8 @@ static int cmd_pub(int argc, char **argv)
         return 1;
     }
 
-    printf("Published %i bytes to topic '%s [%i]'\n",
-            (int)strlen(argv[2]), t.name, t.id);
+    printf("Published %" PRIuSIZE " bytes to topic '%s [%i]'\n",
+           strlen(argv[2]), t.name, t.id);
 
     return 0;
 }
diff --git a/examples/gcoap/client.c b/examples/gcoap/client.c
index ee9416bec4..491a905ef8 100644
--- a/examples/gcoap/client.c
+++ b/examples/gcoap/client.c
@@ -368,8 +368,8 @@ int gcoap_cli_cmd(int argc, char **argv)
             len = coap_opt_finish(&pdu, COAP_OPT_FINISH_NONE);
         }
 
-        printf("gcoap_cli: sending msg ID %u, %u bytes\n", coap_get_id(&pdu),
-               (unsigned) len);
+        printf("gcoap_cli: sending msg ID %u, %" PRIuSIZE " bytes\n",
+               coap_get_id(&pdu), len);
         if (!_send(&buf[0], len, argv[apos])) {
             puts("gcoap_cli: msg send failed");
         }
diff --git a/examples/gcoap_block_server/gcoap_block.c b/examples/gcoap_block_server/gcoap_block.c
index bbad52e3c2..5aece7bde6 100644
--- a/examples/gcoap_block_server/gcoap_block.c
+++ b/examples/gcoap_block_server/gcoap_block.c
@@ -93,8 +93,8 @@ static ssize_t _sha256_handler(coap_pkt_t* pdu, uint8_t *buf, size_t len, coap_r
 
     int blockwise = coap_get_block1(pdu, &block1);
 
-    printf("_sha256_handler: received data: offset=%u len=%u blockwise=%i more=%i\n",
-            (unsigned)block1.offset, pdu->payload_len, blockwise, block1.more);
+    printf("_sha256_handler: received data: offset=%" PRIuSIZE " len=%u blockwise=%i more=%i\n",
+            block1.offset, pdu->payload_len, blockwise, block1.more);
 
     /* initialize sha256 calculation and add payload bytes */
     if (block1.blknum == 0) {
diff --git a/examples/lua_REPL/main.c b/examples/lua_REPL/main.c
index 1632cf2d99..361d726300 100644
--- a/examples/lua_REPL/main.c
+++ b/examples/lua_REPL/main.c
@@ -21,6 +21,7 @@
 #include <stdio.h>
 #include <string.h>
 
+#include "architecture.h"
 #include "lua_run.h"
 #include "lua_builtin.h"
 #include "blob/repl.lua.h"
@@ -44,7 +45,7 @@ const size_t lua_riot_builtin_lua_table_len = 1;
 
 int main(void)
 {
-    printf("Using memory range for Lua heap: %p - %p, %zu bytes\n",
+    printf("Using memory range for Lua heap: %p - %p, %" PRIuSIZE " bytes\n",
            (void *)lua_memory, (void *)(lua_memory + MAIN_LUA_MEM_SIZE), sizeof(void *));
 
     while (1) {
diff --git a/examples/nanocoap_server/coap_handler.c b/examples/nanocoap_server/coap_handler.c
index 6bffe8b224..2e00e256c9 100644
--- a/examples/nanocoap_server/coap_handler.c
+++ b/examples/nanocoap_server/coap_handler.c
@@ -128,8 +128,8 @@ ssize_t _sha256_handler(coap_pkt_t* pkt, uint8_t *buf, size_t len, coap_request_
     coap_block1_t block1;
     int blockwise = coap_get_block1(pkt, &block1);
 
-    printf("_sha256_handler(): received data: offset=%u len=%u blockwise=%i more=%i\n", \
-            (unsigned)block1.offset, pkt->payload_len, blockwise, block1.more);
+    printf("_sha256_handler(): received data: offset=%" PRIuSIZE " len=%u blockwise=%i more=%i\n",
+            block1.offset, pkt->payload_len, blockwise, block1.more);
 
     if (block1.offset == 0) {
         puts("_sha256_handler(): init");
diff --git a/examples/posix_sockets/udp.c b/examples/posix_sockets/udp.c
index 72c5dff351..20f7b0d151 100644
--- a/examples/posix_sockets/udp.c
+++ b/examples/posix_sockets/udp.c
@@ -136,7 +136,7 @@ static int udp_send(char *addr_str, char *port_str, char *data, unsigned int num
             puts("could not send");
         }
         else {
-            printf("Success: send %u byte to %s:%u\n", (unsigned)data_len, addr_str, port);
+            printf("Success: send %" PRIuSIZE " byte to %s:%u\n", data_len, addr_str, port);
         }
 
         usleep(delay);
diff --git a/examples/riot_and_cpp/main.cpp b/examples/riot_and_cpp/main.cpp
index ed4bb02cee..891ed71c8e 100644
--- a/examples/riot_and_cpp/main.cpp
+++ b/examples/riot_and_cpp/main.cpp
@@ -21,6 +21,7 @@
  * @author      DangNhat Pham-Huu <51002279@hcmut.edu.vn>
  */
 
+#include "architecture.h"
 #include "thread.h"
 
 #include "c_functions.h"
@@ -64,7 +65,7 @@ int main()
     vInts.push_back(1);
     vInts.push_back(3);
     vInts.push_back(2);
-    printf("The vector vInts has been filled with %d numbers.\n", (int)vInts.size());
+    printf("The vector vInts has been filled with %" PRIuSIZE " numbers.\n", vInts.size());
 
     printf("\n-= Test iterator =-\n");
     printf("The content of vInts = { ");