diff --git a/providers/fips/self_test.c b/providers/fips/self_test.c
index 551fadecde..f4fd3f51ae 100644
--- a/providers/fips/self_test.c
+++ b/providers/fips/self_test.c
@@ -289,6 +289,7 @@ err:
     OSSL_SELF_TEST_onend(ev, ret);
     EVP_MAC_CTX_free(ctx);
     EVP_MAC_free(mac);
+    OPENSSL_cleanse(out, sizeof(out));
     return ret;
 }
 #endif /* OPENSSL_NO_FIPS_POST */