diff --git a/src/http3.cc b/src/http3.cc
index 9d9185ea..61134ad7 100644
--- a/src/http3.cc
+++ b/src/http3.cc
@@ -201,15 +201,6 @@ int check_nv(const uint8_t *name, size_t namelen, const uint8_t *value,
   return 1;
 }
 
-void dump_nv(FILE *out, const nghttp3_nv *nva, size_t nvlen) {
-  auto end = nva + nvlen;
-  for (; nva != end; ++nva) {
-    fprintf(out, "%s: %s\n", nva->name, nva->value);
-  }
-  fputc('\n', out);
-  fflush(out);
-}
-
 } // namespace http3
 
 } // namespace nghttp2
diff --git a/src/http3.h b/src/http3.h
index dfabd784..81ee0d73 100644
--- a/src/http3.h
+++ b/src/http3.h
@@ -110,18 +110,12 @@ void copy_headers_to_nva(std::vector<nghttp3_nv> &nva,
 void copy_headers_to_nva_nocopy(std::vector<nghttp3_nv> &nva,
                                 const HeaderRefs &headers, uint32_t flags);
 
-// Dumps name/value pairs in |nva| to |out|.
-void dump_nv(FILE *out, const nghttp3_nv *nva, size_t nvlen);
-
 // Checks the header name/value pair using nghttp3_check_header_name()
 // and nghttp3_check_header_value(). If both function returns nonzero,
 // this function returns nonzero.
 int check_nv(const uint8_t *name, size_t namelen, const uint8_t *value,
              size_t valuelen);
 
-// Dumps name/value pairs in |nva| to |out|.
-void dump_nv(FILE *out, const nghttp3_nv *nva, size_t nvlen);
-
 } // namespace http3
 
 } // namespace nghttp2
diff --git a/src/shrpx_http3_upstream.cc b/src/shrpx_http3_upstream.cc
index ae6b080b..08f1f6a7 100644
--- a/src/shrpx_http3_upstream.cc
+++ b/src/shrpx_http3_upstream.cc
@@ -1058,8 +1058,6 @@ int Http3Upstream::on_downstream_header_complete(Downstream *downstream) {
   }
 #endif // HAVE_MRUBY
 
-  auto &http2conf = config->http2;
-
   auto nva = std::vector<nghttp3_nv>();
   // 4 means :status and possible server, via, and set-cookie (for
   // affinity cookie) header field.
@@ -1163,11 +1161,6 @@ int Http3Upstream::on_downstream_header_complete(Downstream *downstream) {
     log_response_headers(downstream, nva);
   }
 
-  if (http2conf.upstream.debug.dump.response_header) {
-    http3::dump_nv(http2conf.upstream.debug.dump.response_header, nva.data(),
-                   nva.size());
-  }
-
   nghttp3_data_reader data_read;
   data_read.read_data = downstream_read_data_callback;
 
@@ -1811,13 +1804,6 @@ int Http3Upstream::http_end_request_headers(Downstream *downstream) {
                      << ss.str();
   }
 
-  auto config = get_config();
-  auto &dump = config->http2.upstream.debug.dump;
-
-  if (dump.request_header) {
-    http2::dump_nv(dump.request_header, nva);
-  }
-
   auto content_length = req.fs.header(http2::HD_CONTENT_LENGTH);
   if (content_length) {
     // libnghttp2 guarantees this can be parsed
@@ -1840,6 +1826,8 @@ int Http3Upstream::http_end_request_headers(Downstream *downstream) {
 
   auto faddr = handler_->get_upstream_addr();
 
+  auto config = get_config();
+
   // For HTTP/2 proxy, we require :authority.
   if (method_token != HTTP_CONNECT && config->http2_proxy &&
       faddr->alt_mode == UpstreamAltMode::NONE && !authority) {