diff --git a/src/encoder.c b/src/encoder.c
index f5cae6cb..4376b59f 100644
--- a/src/encoder.c
+++ b/src/encoder.c
@@ -143,7 +143,7 @@ static int p11prov_rsa_encoder_encode_text(void *inctx, OSSL_CORE_BIO *cbio,
     uri = p11prov_key_to_uri(ctx->provctx, key, selection);
     if (uri) {
         BIO_printf(out, "URI %s\n", uri);
-        free(uri);
+        OPENSSL_free(uri);
     }
 
     BIO_free(out);