diff --git a/lib/ftp.c b/lib/ftp.c
index 5c99d80c4..4e074a111 100644
--- a/lib/ftp.c
+++ b/lib/ftp.c
@@ -1910,13 +1910,13 @@ static CURLcode ftp_state_pasv_resp(struct connectdata *conn,
     if(data->set.ftp_skip_ip) {
       /* told to ignore the remotely given IP but instead use the host we used
          for the control connection */
-      infof(data, "Skip %d.%d.%d.%d for data connection, re-use %s instead\n",
+      infof(data, "Skip %u.%u.%u.%u for data connection, re-use %s instead\n",
             ip[0], ip[1], ip[2], ip[3],
             conn->host.name);
       ftpc->newhost = strdup(control_address(conn));
     }
     else
-      ftpc->newhost = aprintf("%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
+      ftpc->newhost = aprintf("%u.%u.%u.%u", ip[0], ip[1], ip[2], ip[3]);
 
     if(!ftpc->newhost)
       return CURLE_OUT_OF_MEMORY;
diff --git a/lib/http.c b/lib/http.c
index e080ae513..ff1d6813a 100644
--- a/lib/http.c
+++ b/lib/http.c
@@ -1407,7 +1407,7 @@ static CURLcode add_haproxy_protocol_header(struct connectdata *conn)
 
   snprintf(proxy_header,
            sizeof proxy_header,
-           "PROXY %s %s %s %i %i\r\n",
+           "PROXY %s %s %s %li %li\r\n",
            tcp_version,
            conn->data->info.conn_local_ip,
            conn->data->info.conn_primary_ip,
@@ -2132,7 +2132,7 @@ CURLcode Curl_http(struct connectdata *conn, bool *done)
                                     host,
                                     conn->bits.ipv6_ip?"]":"");
     else
-      conn->allocptr.host = aprintf("Host: %s%s%s:%hu\r\n",
+      conn->allocptr.host = aprintf("Host: %s%s%s:%d\r\n",
                                     conn->bits.ipv6_ip?"[":"",
                                     host,
                                     conn->bits.ipv6_ip?"]":"",
diff --git a/lib/http_proxy.c b/lib/http_proxy.c
index c1eb177dd..e10a48829 100644
--- a/lib/http_proxy.c
+++ b/lib/http_proxy.c
@@ -221,7 +221,7 @@ static CURLcode CONNECT(struct connectdata *conn,
       if(!req_buffer)
         return CURLE_OUT_OF_MEMORY;
 
-      host_port = aprintf("%s:%hu", hostname, remote_port);
+      host_port = aprintf("%s:%d", hostname, remote_port);
       if(!host_port) {
         Curl_add_buffer_free(req_buffer);
         return CURLE_OUT_OF_MEMORY;
@@ -245,7 +245,7 @@ static CURLcode CONNECT(struct connectdata *conn,
         if(hostname != conn->host.name)
           ipv6_ip = (strchr(hostname, ':') != NULL);
         hostheader = /* host:port with IPv6 support */
-          aprintf("%s%s%s:%hu", ipv6_ip?"[":"", hostname, ipv6_ip?"]":"",
+          aprintf("%s%s%s:%d", ipv6_ip?"[":"", hostname, ipv6_ip?"]":"",
                   remote_port);
         if(!hostheader) {
           Curl_add_buffer_free(req_buffer);
diff --git a/lib/url.c b/lib/url.c
index 38f08b3c6..701f83ab3 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -3419,7 +3419,7 @@ static CURLcode parse_remote_port(struct Curl_easy *data,
        * stripped off. It would be better to work directly from the original
        * URL and simply replace the port part of it.
        */
-      url = aprintf("%s://%s%s%s:%hu%s%s%s", conn->given->scheme,
+      url = aprintf("%s://%s%s%s:%d%s%s%s", conn->given->scheme,
                     conn->bits.ipv6_ip?"[":"", conn->host.name,
                     conn->bits.ipv6_ip?"]":"", conn->remote_port,
                     data->state.slash_removed?"/":"", data->state.path,
diff --git a/lib/vtls/mbedtls.c b/lib/vtls/mbedtls.c
index 4ec9fa18e..d7759dc84 100644
--- a/lib/vtls/mbedtls.c
+++ b/lib/vtls/mbedtls.c
@@ -815,7 +815,7 @@ static void Curl_mbedtls_session_free(void *ptr)
 static size_t Curl_mbedtls_version(char *buffer, size_t size)
 {
   unsigned int version = mbedtls_version_get_number();
-  return snprintf(buffer, size, "mbedTLS/%d.%d.%d", version>>24,
+  return snprintf(buffer, size, "mbedTLS/%u.%u.%u", version>>24,
                   (version>>16)&0xff, (version>>8)&0xff);
 }