diff --git a/gennghttpxfun.py b/gennghttpxfun.py
index cb4ed697..cadd11a2 100755
--- a/gennghttpxfun.py
+++ b/gennghttpxfun.py
@@ -182,6 +182,7 @@ OPTIONS = [
     "http2-altsvc",
     "frontend-http3-read-timeout",
     "frontend-quic-idle-timeout",
+    "frontend-quic-debug-log",
 ]
 
 LOGVARS = [
diff --git a/src/shrpx.cc b/src/shrpx.cc
index ea6c18d5..ca4f2b6c 100644
--- a/src/shrpx.cc
+++ b/src/shrpx.cc
@@ -2892,6 +2892,8 @@ QUIC:
               Specify an idle timeout for QUIC connection.
               Default: )"
       << config->quic.upstream.timeout.idle << R"(
+  --frontend-quic-debug-log
+              Output QUIC debug log to /dev/stderr.
   --bpf-program-file=<PATH>
               Specify a path to  eBPF program file reuseport_kern.o to
               direct  an  incoming  QUIC  UDP datagram  to  a  correct
@@ -3609,6 +3611,7 @@ int main(int argc, char **argv) {
          &flag, 172},
         {SHRPX_OPT_FRONTEND_QUIC_IDLE_TIMEOUT.c_str(), required_argument, &flag,
          173},
+        {SHRPX_OPT_FRONTEND_QUIC_DEBUG_LOG.c_str(), no_argument, &flag, 174},
         {nullptr, 0, nullptr, 0}};
 
     int option_index = 0;
@@ -4434,6 +4437,11 @@ int main(int argc, char **argv) {
         cmdcfgs.emplace_back(SHRPX_OPT_FRONTEND_QUIC_IDLE_TIMEOUT,
                              StringRef{optarg});
         break;
+      case 174:
+        // --frontend-quic-debug-log
+        cmdcfgs.emplace_back(SHRPX_OPT_FRONTEND_QUIC_DEBUG_LOG,
+                             StringRef::from_lit("yes"));
+        break;
       default:
         break;
       }
diff --git a/src/shrpx_config.cc b/src/shrpx_config.cc
index 05c6cb20..0cfb62f0 100644
--- a/src/shrpx_config.cc
+++ b/src/shrpx_config.cc
@@ -2275,6 +2275,11 @@ int option_lookup_token(const char *name, size_t namelen) {
         return SHRPX_OPTID_PRIVATE_KEY_PASSWD_FILE;
       }
       break;
+    case 'g':
+      if (util::strieq_l("frontend-quic-debug-lo", name, 22)) {
+        return SHRPX_OPTID_FRONTEND_QUIC_DEBUG_LOG;
+      }
+      break;
     case 'r':
       if (util::strieq_l("backend-response-buffe", name, 22)) {
         return SHRPX_OPTID_BACKEND_RESPONSE_BUFFER;
@@ -3892,6 +3897,12 @@ int parse_config(Config *config, int optid, const StringRef &opt,
 #else  // !ENABLE_HTTP3
     return 0;
 #endif // !ENABLE_HTTP3
+  case SHRPX_OPTID_FRONTEND_QUIC_DEBUG_LOG:
+#ifdef ENABLE_HTTP3
+    config->quic.upstream.debug.log = util::strieq_l("yes", optarg);
+#endif // ENABLE_HTTP3
+
+    return 0;
   case SHRPX_OPTID_CONF:
     LOG(WARN) << "conf: ignored";
 
diff --git a/src/shrpx_config.h b/src/shrpx_config.h
index 13853b69..10b5b72c 100644
--- a/src/shrpx_config.h
+++ b/src/shrpx_config.h
@@ -371,6 +371,8 @@ constexpr auto SHRPX_OPT_FRONTEND_HTTP3_READ_TIMEOUT =
     StringRef::from_lit("frontend-http3-read-timeout");
 constexpr auto SHRPX_OPT_FRONTEND_QUIC_IDLE_TIMEOUT =
     StringRef::from_lit("frontend-quic-idle-timeout");
+constexpr auto SHRPX_OPT_FRONTEND_QUIC_DEBUG_LOG =
+    StringRef::from_lit("frontend-quic-debug-log");
 
 constexpr size_t SHRPX_OBFUSCATED_NODE_LENGTH = 8;
 
@@ -1171,6 +1173,7 @@ enum {
   SHRPX_OPTID_FRONTEND_KEEP_ALIVE_TIMEOUT,
   SHRPX_OPTID_FRONTEND_MAX_REQUESTS,
   SHRPX_OPTID_FRONTEND_NO_TLS,
+  SHRPX_OPTID_FRONTEND_QUIC_DEBUG_LOG,
   SHRPX_OPTID_FRONTEND_QUIC_IDLE_TIMEOUT,
   SHRPX_OPTID_FRONTEND_READ_TIMEOUT,
   SHRPX_OPTID_FRONTEND_WRITE_TIMEOUT,