diff --git a/lib/vquic/curl_ngtcp2.c b/lib/vquic/curl_ngtcp2.c
index b5be05afc7..d626610b3a 100644
--- a/lib/vquic/curl_ngtcp2.c
+++ b/lib/vquic/curl_ngtcp2.c
@@ -1141,7 +1141,7 @@ static int cb_h3_recv_data(nghttp3_conn *conn, int64_t stream3_id,
   if(stream->rx_offset_max < stream->rx_offset)
     stream->rx_offset_max = stream->rx_offset;
 
-  CURL_TRC_CF(data, cf, "[%" PRId64 "] DATA len=%zu, rx win=%" PRId64,
+  CURL_TRC_CF(data, cf, "[%" PRId64 "] DATA len=%zu, rx win=%" PRIu64,
               stream->id, blen, stream->rx_offset_max - stream->rx_offset);
   cf_ngtcp2_upd_rx_win(cf, data, stream);
   return 0;
@@ -1587,7 +1587,7 @@ static nghttp3_ssize cb_h3_read_req_body(nghttp3_conn *conn, int64_t stream_id,
   }
 
   CURL_TRC_CF(data, cf, "[%" PRId64 "] read req body -> "
-              "%d vecs%s with %zu (buffered=%zu, left=%" FMT_OFF_T ")",
+              "%d vecs%s with %zd (buffered=%zu, left=%" FMT_OFF_T ")",
               stream->id, (int)nvecs,
               *pflags == NGHTTP3_DATA_FLAG_EOF ? " EOF" : "",
               nwritten, Curl_bufq_len(&stream->sendbuf),
@@ -1850,7 +1850,7 @@ static CURLcode cf_ngtcp2_recv_pkts(const unsigned char *buf, size_t buflen,
 
   if(ecn)
     CURL_TRC_CF(pktx->data, pktx->cf, "vquic_recv(len=%zu, gso=%zu, ecn=%x)",
-                buflen, gso_size, ecn);
+                buflen, gso_size, (unsigned int)ecn);
   ngtcp2_addr_init(&path.local, (struct sockaddr *)&ctx->q.local_addr,
                    ctx->q.local_addrlen);
   ngtcp2_addr_init(&path.remote, (struct sockaddr *)remote_addr,
@@ -2244,7 +2244,7 @@ static CURLcode cf_ngtcp2_shutdown(struct Curl_cfilter *cf,
       (uint8_t *)buffer, sizeof(buffer),
       &ctx->last_error, pktx.ts);
     CURL_TRC_CF(data, cf, "start shutdown(err_type=%d, err_code=%"
-                PRIu64 ") -> %zd", ctx->last_error.type,
+                PRIu64 ") -> %zd", (int)ctx->last_error.type,
                 ctx->last_error.error_code, (ssize_t)nwritten);
     /* there are cases listed in ngtcp2 documentation where this call
      * may fail. Since we are doing a connection shutdown as graceful
@@ -2771,7 +2771,7 @@ out:
     result = CURLE_COULDNT_CONNECT;
     if(cerr) {
       CURL_TRC_CF(data, cf, "connect error, type=%d, code=%" PRIu64,
-                  cerr->type, cerr->error_code);
+                  (int)cerr->type, cerr->error_code);
       switch(cerr->type) {
       case NGTCP2_CCERR_TYPE_VERSION_NEGOTIATION:
         CURL_TRC_CF(data, cf, "error in version negotiation");