diff --git a/t/openssl.c b/t/openssl.c
index ff47eee..f76d972 100644
--- a/t/openssl.c
+++ b/t/openssl.c
@@ -25,9 +25,13 @@
 #include <assert.h>
 #include <stdio.h>
 #include <string.h>
+#include <openssl/opensslv.h>
 #include <openssl/bio.h>
 #include <openssl/pem.h>
 #include <openssl/engine.h>
+#if !defined(LIBRESSL_VERSION_NUMBER) && OPENSSL_VERSION_NUMBER >= 0x30000000L
+#include <openssl/provider.h>
+#endif
 #include "picotls.h"
 #include "picotls/minicrypto.h"
 #include "../deps/picotest/picotest.h"
@@ -299,6 +303,12 @@
     ENGINE_register_all_digests();
 #endif
 
+#if !defined(LIBRESSL_VERSION_NUMBER) && OPENSSL_VERSION_NUMBER >= 0x30000000L
+    /* Explicitly load the legacy provider in addition to default, as we test Blowfish in one of the tests. */
+    OSSL_PROVIDER *legacy = OSSL_PROVIDER_load(NULL, "legacy");
+    OSSL_PROVIDER *dflt = OSSL_PROVIDER_load(NULL, "default");
+#endif
+
     subtest("bf", test_bf);
 
     subtest("key-exchange", test_key_exchanges);