diff --git a/client/src/config.rs b/client/src/config.rs
index fd8abc3..92767e9 100644
--- a/client/src/config.rs
+++ b/client/src/config.rs
@@ -276,7 +276,7 @@ impl RawConfig {
             "SERVER_IP",
         );
 
-        opts.optopt(
+        opts.optmulti(
             "",
             "certificate",
             "Set custom X.509 certificate alongside native CA roots for the QUIC handshake. This option can be used multiple times to set multiple certificates",
@@ -304,7 +304,7 @@ impl RawConfig {
             "HEARTBEAT_INTERVAL",
         );
 
-        opts.optopt(
+        opts.optmulti(
             "",
             "alpn",
             "Set ALPN protocols included in the TLS client hello. This option can be used multiple times to set multiple ALPN protocols. If not set, no ALPN extension will be sent",
diff --git a/server/src/config.rs b/server/src/config.rs
index 297d605..7c8083b 100644
--- a/server/src/config.rs
+++ b/server/src/config.rs
@@ -163,7 +163,7 @@ impl RawConfig {
 
         opts.optopt("", "port", "Set the server listening port", "SERVER_PORT");
 
-        opts.optopt(
+        opts.optmulti(
             "",
             "token",
             "Set the token for TUIC authentication. This option can be used multiple times to set multiple tokens.",
@@ -212,7 +212,7 @@ impl RawConfig {
             "AUTHENTICATION_TIMEOUT",
         );
 
-        opts.optopt(
+        opts.optmulti(
             "",
             "alpn",
             "Set ALPN protocols that the server accepts. This option can be used multiple times to set multiple ALPN protocols. If not set, the server will not check ALPN at all",