diff --git a/client/emv/crypto_polarssl.c b/client/emv/crypto_polarssl.c
index 3b0a7d801..ff5a867a9 100644
--- a/client/emv/crypto_polarssl.c
+++ b/client/emv/crypto_polarssl.c
@@ -208,7 +208,7 @@ static unsigned char *crypto_pk_polarssl_encrypt(const struct crypto_pk *_cp, co
 
     res = mbedtls_rsa_public(&cp->ctx, buf, result);
     if (res) {
-        printf("RSA encrypt failed. Error: %x data len: %zd key len: %zd\n", res * -1, len, keylen);
+        printf("RSA encrypt failed. Error: %x data len: %zu key len: %zu\n", res * -1, len, keylen);
         free(result);
         return NULL;
     }
@@ -234,7 +234,7 @@ static unsigned char *crypto_pk_polarssl_decrypt(const struct crypto_pk *_cp, co
 
     res = mbedtls_rsa_private(&cp->ctx, NULL, NULL, buf, result); // CHECK???
     if (res) {
-        printf("RSA decrypt failed. Error: %x data len: %zd key len: %zd\n", res * -1, len, keylen);
+        printf("RSA decrypt failed. Error: %x data len: %zu key len: %zu\n", res * -1, len, keylen);
         free(result);
         return NULL;
     }
diff --git a/client/emv/emv_pk.c b/client/emv/emv_pk.c
index 4c6afa88e..9b5f2e714 100644
--- a/client/emv/emv_pk.c
+++ b/client/emv/emv_pk.c
@@ -483,7 +483,7 @@ struct emv_pk *emv_pk_get_ca_pk(const unsigned char *rid, unsigned char idx) {
     if (!pk)
         return NULL;
 
-    printf("Verifying CA PK for %02hhx:%02hhx:%02hhx:%02hhx:%02hhx IDX %02hhx %zd bits...",
+    printf("Verifying CA PK for %02hhx:%02hhx:%02hhx:%02hhx:%02hhx IDX %02hhx %zu bits...",
            pk->rid[0],
            pk->rid[1],
            pk->rid[2],
diff --git a/client/emv/emv_roca.c b/client/emv/emv_roca.c
index 3a89020c7..c0d0d419d 100644
--- a/client/emv/emv_roca.c
+++ b/client/emv/emv_roca.c
@@ -84,7 +84,7 @@ void print_mpi(const char *msg, int radix, const mbedtls_mpi *X) {
     size_t len = 0;
 
     mbedtls_mpi_write_string(X, radix, Xchar, sizeof(Xchar), &len);
-    printf("%s[%ld] %s\n", msg, len, Xchar);
+    printf("%s[%zu] %s\n", msg, len, Xchar);
 }
 
 bool emv_rocacheck(const unsigned char *buf, size_t buflen, bool verbose) {
diff --git a/client/flasher.c b/client/flasher.c
index bc744b339..cb77ce719 100644
--- a/client/flasher.c
+++ b/client/flasher.c
@@ -23,11 +23,11 @@
 void cmd_debug(UsbCommand *c) {
     //  Debug
     printf("UsbCommand length[len=%zd]\n", sizeof(UsbCommand));
-    printf("  cmd[len=%zd]: %016" PRIx64"\n", sizeof(c->cmd), c->cmd);
-    printf(" arg0[len=%zd]: %016" PRIx64"\n", sizeof(c->arg[0]), c->arg[0]);
-    printf(" arg1[len=%zd]: %016" PRIx64"\n", sizeof(c->arg[1]), c->arg[1]);
-    printf(" arg2[len=%zd]: %016" PRIx64"\n", sizeof(c->arg[2]), c->arg[2]);
-    printf(" data[len=%zd]: ", sizeof(c->d.asBytes));
+    printf("  cmd[len=%zu]: %016" PRIx64"\n", sizeof(c->cmd), c->cmd);
+    printf(" arg0[len=%zu]: %016" PRIx64"\n", sizeof(c->arg[0]), c->arg[0]);
+    printf(" arg1[len=%zu]: %016" PRIx64"\n", sizeof(c->arg[1]), c->arg[1]);
+    printf(" arg2[len=%zu]: %016" PRIx64"\n", sizeof(c->arg[2]), c->arg[2]);
+    printf(" data[len=%zu]: ", sizeof(c->d.asBytes));
 
     for (size_t i = 0; i < 16; i++)
         printf("%02x", c->d.asBytes[i]);
diff --git a/uart/uart_posix.c b/uart/uart_posix.c
index 92af6774a..4c9e8b990 100644
--- a/uart/uart_posix.c
+++ b/uart/uart_posix.c
@@ -206,7 +206,7 @@ serial_port uart_open(const char *pcPortName, uint32_t speed) {
             }
         }
     }
-    printf("[=] UART Setting serial baudrate %i\n", speed);
+    printf("[=] UART Setting serial baudrate %u\n", speed);
     return sp;
 }