diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index 26c27ce91..6fde7b681 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -2046,7 +2046,7 @@ requires_config_enabled MBEDTLS_SSL_PROTO_TLS1_3
 requires_config_enabled MBEDTLS_USE_PSA_CRYPTO
 requires_config_enabled MBEDTLS_RSA_C
 run_test    "TLS 1.3 opaque key: no suitable algorithm found" \
-            "$P_SRV debug_level=4 force_version=tls13 key_opaque=1 key_opaque_algs=rsa-decrypt,none" \
+            "$P_SRV debug_level=4 force_version=tls13 auth_mode=required key_opaque=1 key_opaque_algs=rsa-decrypt,none" \
             "$P_CLI debug_level=4 key_opaque=1 key_opaque_algs=rsa-decrypt,rsa-sign-pss" \
             1 \
             -s "The SSL configuration is tls13 only" \
@@ -2059,7 +2059,7 @@ requires_config_enabled MBEDTLS_SSL_PROTO_TLS1_3
 requires_config_enabled MBEDTLS_USE_PSA_CRYPTO
 requires_config_enabled MBEDTLS_RSA_C
 run_test    "TLS 1.3 opaque key: suitable algorithm found" \
-            "$P_SRV debug_level=4 force_version=tls13 key_opaque=1 key_opaque_algs=rsa-decrypt,rsa-sign-pss" \
+            "$P_SRV debug_level=4 force_version=tls13 auth_mode=required key_opaque=1 key_opaque_algs=rsa-decrypt,rsa-sign-pss" \
             "$P_CLI debug_level=4 key_opaque=1 key_opaque_algs=rsa-decrypt,rsa-sign-pss" \
             0 \
             -s "The SSL configuration is tls13 only" \
@@ -2072,7 +2072,7 @@ requires_config_enabled MBEDTLS_SSL_PROTO_TLS1_3
 requires_config_enabled MBEDTLS_USE_PSA_CRYPTO
 requires_config_enabled MBEDTLS_RSA_C
 run_test    "TLS 1.3 opaque key: 2 keys on server, suitable algorithm found" \
-            "$P_SRV debug_level=4 force_version=tls13 key_opaque=1 key_opaque_algs2=ecdsa-sign,none key_opaque_algs=rsa-decrypt,rsa-sign-pss" \
+            "$P_SRV debug_level=4 force_version=tls13 auth_mode=required key_opaque=1 key_opaque_algs2=ecdsa-sign,none key_opaque_algs=rsa-decrypt,rsa-sign-pss" \
             "$P_CLI debug_level=4 key_opaque=1 key_opaque_algs=rsa-decrypt,rsa-sign-pss" \
             0 \
             -s "The SSL configuration is tls13 only" \